Revision of the Subgenus Burlinius Lopatin (Coleoptera, Chrysomelidae, Cryptocephalinae) from China and Description of Four New Species †

: This study revised the subgenus Burlinius Lopatin, 1965, of the genus Cryptocephalus Geoffroy, 1762 (Coleoptera, Chrysomelidae, Cryptocephalinae, Cryptocephalini), and describes four new species, namely, Cryptocephalus ( Burlinius ) longchiensis sp. nov., C. ( Burlinius ) baowenzhengi sp. nov., C. ( Burlinius ) tomurensis sp. nov., and C. ( Burlinius ) glabrelegantulus sp. nov. The species C. ( Burlinius ) turpis Chen, 1942, and C . (Burlinius ) yangweii Chen, 1942, were revalidated and treated as distinct species. Another four species were transferred into this subgenus from the subgenus Cryptocephalus , namely, C. (Burlinius) ﬂavolimbatus Pic, 1920 (stat. nov.), C. (Burlinius) pusus Schöller, 2009 (stat. nov.), C. (Burlinius) scutemaculatus Tan, 1992 (stat. nov.), and C. (Burlinius) shaowuanus Gressitt & Kimoto, 1961 (stat. nov.). Two species (including one more subspecies) were removed out of this subgenus, namely, C. (Burlinius) nigrolimbatus Jacoby, 1890, C. (Burlinius) pallidipes Pic, 1927, and C. (Burlinius) pallidipes nakatae Gressitt & Kimoto, 1961; they were transferred into the subgenus Cryptocephalus . Thus, the subgenus Burlinius Lopatin includes now a total of 26 species in China according to our revision. A key to all the Chinese species of this subgenus is provided as well as color illustrations and line drawings for the general habitus and genital structures.


Introduction
The subgenus Burlinius Lopatin, 1965 [1], is a special leaf beetle group within the megadiverse genus Cryptocephalus Geoffroy, 1762 [2] (Coleoptera, Chrysomelidae, Cryptocephalinae, Cryptocephalini). It was created by Lopatin (1965), based on the type species of Chrysomela fulva Goeze, 1777 [3], which included 52 species at the time of its creation, which were originally included in the genus Cryptocephalus Geoffroy but had not yet been assigned to any subgenus. Before the present study, the subgenus Burlinius Lopatin included 128 species, which were distributed mainly in the Palearctic region [1,4,5] (Lopatin, 1965;Warchałowski, 2010;Lopatin et al., 2010). The species number of Burlinius Lopatin was growing along with taxonomic knowledge of the megadiverse genus Cryptocephalus. In addition to 52 species included originally in Burlinius, Warchałowski (2010) [5] increased the number to 94 species and subdivided them into four different species groups in his book, titled "The Palearctic Chrysomelidae: identification keys". In the book series "Catalogue of Palearctic Coleoptera" (edited by Löbl and Smetana), Lopatin et al. (2010) [4] catalogued a number of 121 species and another 10 subspecies in this subgenus. Regarding the Chinese fauna, Chen (1942) [6] studied the Chinese Cryptocephalus and Gressitt, and Kimoto (1961) [7] revised the entire leaf beetles' fauna of China and Korea; there were 13 Burlinius species reported to occur in China, but they were not assigned to any subgenus then. Before our study, a total of 19 species of Burlinius were found to occur in China pronotum or at the same level and the inner margin of the eyes are slightly notched. The antennae filiform are thin and long, usually longer than half of the body. The pronotum is transversed, with slightly rounded sides and is widest at the hind angles. The lateral margins are narrow with the basal part simultaneously visible in the dorsal view. The scutellum is triangular, longer than it is broad, and apically occasionally elevated and impunctated. The elytra is regularly punctated, longer than it is wide, with an interception behind the humeral tubercles, widest behind the middle, and usually slightly rounded at the apex. The elytra in the lateral view has a weak, epipleural lobe. The underside is usually covered with a sparsely short pubescence and distinct punctures. The prosternum varies, sometimes with an apical margin drawn out into a denticle visible in the lateral view. The mesoventrite is usually broad. The pygidium is usually with dense punctures and a slightly long pubescence. The claw segment of the hind tarsus is short, with only half or less than half of its length protruding from the lobes of the third segment. The lobe of the aedeagus is apically prolonged into three (rarely into two) processes; its opening is situated not dorsally, but apically. (1). Upper side entirely blue with metallic luster; or entirely black, sometimes only basal margin or part, sutural margins, and apical region of elytra reddish or yellowish brown 2 -Upper side not entirely black and not entirely metallic blue 12 (2). Upper side entirely blue with metallic luster 3 -Upper side entirely black, sometimes only basal part or sutural margin of elytra reddish or yellowish brown 5 (3). Pronotum densely and distinctly punctate, and males have pronotum with anteriorand lateral margins yellow C. confusus Suffrian -Pronotum smooth and shiny, impunctate 4 (4). Elytra coarsely punctate, and puncture-rows grooved C. baowenzhengi sp. nov. -Elytra finely punctate, and puncture-row without groove C. aphthonoides Chen (5). Upper side entirely black 6 -Upper side not entirely black, tinged with reddish or yellowish brown 9 (6). Pronotum smooth and shiny, impunctate, yellow, with variable black markings 7 -Pronotum distinctly punctate 8 (7). Elytral puncture rows with deep groove; legs yellow C. glabrelegantulus sp. nov. -Elytral puncture rows without groove; legs yellowish red, hind femora darkened C. norensis Pic (8). Pronotum finely punctate C. exiguus amiculus Baly -Pronotum coarsely and distinctly punctate C. pusus Schöller (9). Elytra entirely black, pronotum with apical margin red C. sichuanicus Lopatin -Elytra not entirely black, pronotum black 10 (10). Elytra with sutural and apical margins pitchy brown, scutellum pitchy black C. hohuanshanus Kimoto -Elytral apical region reddish or yellowish brown 11 (11). Elytral apical region yellowish brown, disc of scutellum yellow C. tomurensis sp. nov.

Key to Species of the Subgenus Burlinius from China
-Elytra apical region reddish brown, disc of scutellum yellowish black C. kabaki Lopatin (12). Elytra mostly darkish red 13 -Elytra not mostely darkish red 15 (13). Pronotum darkish red, same as elytra C. nebulo Weise -Pronotum black or yellowish brown, different color from elytra (14). Pronotum black C. nigrorufus Gressitt -Pronotum yellowish brown C. scutemaculatus Tan (15). Elytra entirely black, sometimes apical region yellow 16 -Elytra not black 17 (16). Elytra entirely black; pronotum yellowish brown; disc of scutellum yellowish brown, margins black C. petulans Weise -Elytra black, apical region yellow; pronotum yellow, with two black spots C. pallidoapicalis Pic (17). Upper side entirely yellowish brown, except pronotal elytral margins and scutellum 18 -Upper side not entirely yellowish brown 20 (18). Pronotum distinctly and densely punctate C. turpis Chen -Pronotum finely punctate 19 (19). Prosternum width longer than length, basal margin with big and broad teeth     Description. Body (Figure 2A) is elongated cylindrical, smooth, and testaceous. The head is reddish-brown with antennae with five basal segments that are reddish-brown; the remaining segments are darkish brown. The clypeus is reddish brown, the labrum is yellowish-brown, and the mandibles are black. The pronotum is reddish-brown, darker than the elytra, with a basal margin that is black. The scutellum is black and has a disc with a small, reddish-brown spot. The elytral base and suture are black, while the humeri is tinged with brown. The legs are reddish-brown and the venter is darkish brown.
Head is dull, with a frons that us is shallow and a short longitudinal groove that is sparsely and finely punctated. The eyes are kidney shaped. The clypeus is triangular, finely and transversely wrinkled, with an anterior margin that is slightly arcuately emarginated and a posterior margin that is concave. The antennae reach two-thirds of the region of the elytra. The first segment is clubbed, the second is oblong, about half as long as the first. The third through fifth are slender, with the third as long as the second, and the fourth longer than the third and shorter than the fifth. From the sixth segment on, a somewhat broadened and flattened terminal segment is pointed apically.
Pronotum ( Figure 2A) is shallowly and densely punctated, distinctly vaulted, with a base much broader than the apex and a basal width about 1.8 times the length of the lateral margins. The anterior margin is nearly straight. Lateral margins are slightly wide. In the dorsal view, half the basal part is visible and widest at the hind angles. The posterior margin is slightly serrated and undulated. The scutellum is triangular, longer than it is broad, apically not elevated, and impunctated. Elytra ( Figure 2A) is oblong, almost parallel sided, slightly more than twice as long as broad, rounded apically, and slightly sinuated laterally in the dorsal view. The elytral humeri are very distinct and slightly elevated. There is a disc with regular rows of punctures, getting slightly finer towards the apex, with interspaces that are flat, with scattered minute punctures between the rows and epipleura that are obliquely visible in the lateral view.
Prosternum ( Figure 1A,B) width is longer than the length, with a broad prosternal process and an apical margin that is drawn out into a broad denticle, visible in the lateral view.
Mesoventrite ( Figure 1A,B) is broad, twice as wide as long, with a basal margin that forms a pair of teeth. The metaventrite has coarse punctures. The pygidium has dense punctures and a slightly long pubescence.
Aedeagus ( Figure 2D-F and Figure 3A-C) is elongated, about 4.8 times as long as it is wide, and strongly bent. The apex is prolonged into three processes with a short, small dorsal process. The ventral processes are broad and nearly triangular, strongly bent in the lateral view. Laterally, they have sparse punctures. Medially of the ventral processes, there is a dense, long pubescence. The tegmen is Y-shaped, weakly sclerotized, almost translucent, and bifurcated at the basal fifth.
Female. Body more robust than male. The spermatheca ( Figures 2C and 3D) is hook shaped, moderately acute at the apex, and slightly dilated at the basal third. The rectal sclerites are moderately sclerotized and not connected between two rectangular sclerites on ventral side.
The distribution is China (Sichuan). Diagnosis. This new species is similar to C. (Burlinius) nigrofasciatus Jacoby [8], but can be distinguished by a broad pronotum and a black scutellum. It is also similar to C. (Burlinius) fulvus (Goeze) [3], but can be distinguished by the following characteristics: The prosternum ( Figure 1A-B) is wider than it is long, with bigger and broader denticles on the basal margin; the aedeagus ( Figure 2D-F and Figure 3A-C) is strongly bent, and the aedeagus apex with the three lobes is nearly equal in length.
Etymology. The specific epithet is derived from Longchi, the Chinese name (Pinyin) of the type of locality.   Description. Body ( Figure 4A) is elongated cylindrical, smooth, shining, and steel-blue colored. The head is mostly yellow, with a vertex that is pitchy brown, antennae with basal five segments that are yellowish-brown, and remaining segments that are darkish brown. The clypeus is yellowish-brown and the mandibles are darkish brown. The scutellum is blackish-blue and darker than the pronotum and elytra. The legs are reddish-brown, the venter is mostly dark steel-blue colored, the prosternum is yellowish-brown, and the mesoventrite is reddish-brown.
Head is nearly round, with a frons in between the eyes with a very shallow and short longitudinal groove, and impunctated. The eyes are kidney shaped and deeply emarginated. The clypeus is triangular with an anterior margin that is slightly arcuately emarginated and a posterior margin that is concave. The antennae are long and thin, reaching three-fourths of the region of the elytra. The first segment clubbed, the second is oblong, about half as long as the first. The third through fifth are slender, with the third as long as the second, and the fourth longer than the third and shorter than the fifth. From the sixth segment on, they are somewhat broadened and flattened, with a terminal segment pointed apically.
Pronotum ( Figure 4A) is smooth and shining, much broader basely than it is apically, with a basal width about 1.8 times the length of the lateral margins. The anterior margin is slightly convex and nearly straight. The lateral margins are slightly wide. In the dorsal view, two-thirds of the basal part is visible and widest at the hind angles. The disc is slightly convex and finely and sparsely punctated. The scutellum is triangular, longer than it is broad, apically elevated, and impunctated. Elytra ( Figure 4A) is oblong, with elytral humeri that are prominent and glabrous, and is widest slightly behind the humerus. There is a disc with regular rows of punctures, a puncture row that is slightly grooved, punctures that are partly confused on the apical slope, interspaces that are nearly impunctated, and epipleura that are weakly obliquely visible in the lateral view.
Venter is nearly impunctated. The prosternum's ( Figure 1C-D) width is shorter than its length, with small and nearly round protrusions, an apical margin that is concave, and hind angles that are nearly round. The mesoventrite ( Figure 1C-D) is long, 1.5 times as long as it is wide, with denser protrusions, a basal margin that is slightly concave and hind angles that are acute. The metaventrite is nearly impunctated and wrinkled. The pygidium has dense punctures and a long pubescence.
Aedeagus ( Figure 4D-F and Figure 5A-C) is elongate, about 3.3 times as long as it is wide, and slightly bent. The apex is prolonged into three processes, with a dorsal process that is arched, laterally with fine and sparse punctures, and ventral processes that are thin and long, longer than the dorsal processes, and moderately bent in the lateral view. The tegmen is Y-shaped, moderately sclerotized, and bifurcated at the basal fourth.
Female. Body more robust than male. The spermatheca ( Figures 4C and 5D) is dull and hook shaped, weakly acute at the apex, and strongly dilated at the basal two-thirds, with an absent duct. The rectal sclerites are weakly sclerotized and not connected between the two rectangular sclerites on the ventral side.
The distribution is China (Sichuan, Shaanxi). Diagnosis. This new species is similar to C. (Burlinius) pallifrons Gyllenhal [9], but can be distinguished with the aedeagus ( Figure 4D-F and Figure 5A-C) with three separate lobes of equal length in the dorsal view. It is similar to C. (Burlinius) frontalis Marsham [10], but differs with the latter by the dorsal side displaying a metallic-blue shine. It is also similar to C. (Burlinius) aphthonoides Chen [6], but can be distinguished by the elytra with coarse punctures and groove-formed puncture rows.
Etymology. The specific epithet is dedicated to memorialize an historical figure in China, Bao Wen-Zheng (Song Dynasty).   Description. Body ( Figure 6A) is elongated cylindrical, smooth, and largely black. The head is mostly yellow, with a vertex that is darkish brown, with two darkish brown markings between the antennal insertions, antennae with basal five segments that are lightly yellowish-brown, and remaining segments that are brown. The clypeus is reddish-brown, the labrum is yellowish-brown, and the mandibles are darkish brown. The pronotum has an anterior margin that is tinged with yellow. The scutellum is pale yellow with margins that are black. The elytra has an apical region that is yellow. The legs are pale reddish-brown, and the venter is black, except for the prosternum, which is yellow.
Head is round, with a frons in between the eyes with a distinct and short longitudinal groove coarsely and densely punctated. The eyes are kidney shaped and blunt. The clypeus is prominent and vertically wrinkled, with an anterior margin on the gena, and a posterior margin that is strongly concaved and pubescent. The antennae are slightly short and sparsely pubescent, reaching half of the region of the elytra, with a first segment that is clubbed and a second segment that is slightly oblong, about half as long as the first. The third through fifth segments are slender, with the third as long as the second, and the fourth longer than the third and shorter than fifth. From the sixth segment on, they are somewhat broadened and flattened with a terminal segment that is pointed apically.
Pronotum ( Figure 6A) is slightly concaved, smooth, and shining, with a base that is much broader basely than it is apically, and a basal width about two times the length of the lateral margins. The anterior margin is nearly straight. The lateral margin is a little wide. In the dorsal view, one-fourth of the basal part is visible and widest at the hind angles. The posterior margin is slightly undulated. The scutellum is a trapezoid, longer than it is broad, apically elevated, visible in lateral view, impunctate. Elytra ( Figure 6A) is oblong, as broad as the prothorax at the base. The elytral humeri are somewhat prominent, wider from the humerus, and glabrous. The disc is very finely punctated, arranged in regular rows, partly confused on the apical slope, with interspaces are flat, and with scattered, very minute, and fine punctures between rows. It is hardly detectable. The epipleura are weak, obliquely placed, and visible in the lateral view.
Prosternum ( Figure 1E,F) width is shorter than its length. The prosternal process is weak, with an apical margin drawn out into a broad and small denticle. The mesoventrite ( Figure 1E,F) is slightly oblong, half as wide as it is long, with a basal margin that is nearly straight. The metaventrite is sparsely punctated. The pygidium has dense punctures and a slightly long pubescence.
Aedeagus ( Figure 6D-F and Figure 7A-C) is elongated, about 5.1 times as long as it is wide, and weakly bent. The apex is prolonged into three processes. The dorsal process is oblong, with an inner side that has fine and sparse punctures. The ventral processes are thin and long, as long as the dorsal process, and slightly bent in the lateral view. The ventral side has a mouth. The tegmen is Y-shaped, weakly sclerotized, and bifurcate at the basal third.
Female. Body more robust than male. The Spermatheca ( Figures 6C and 7D) is thin and hook shaped, strongly acute at the apex, and not dilated at the basal. The rectal sclerites are strongly sclerotized and connected between the two rectangular sclerites on the ventral side.
The distribution is China (Xinjiang). Diagnosis. This new species is similar to C. (Burlinius) kabaki Lopatin [11], but can be distinguished by the first five antennal segments that are yellowish brown and the elytral apical region that is yellowish brown. He body beneath is black except for the prosternum ( Figure 1E-F), which is lightly yellow. The aedeagus of this species is also similar to C. (Burlinius) nebulo Weise [12], but can be distinguished by the aedeagus: The latter species is slightly wider, the three apical processes take a larger proportion of the whole, and the shape and coloration of the prosternum are totally different.
Etymology. The specific epithet is derived from the name of the type of locality: Aksu, in Xinjiang, China. Description. Body ( Figure 8A) is oblong, with a dorsum that is entirely black. The head is largely yellow and the vertex and antennal insertions are black. The frons has a black, longitudinal stripe. The margins of clypeus and mandibles are reddish brown. The antennae with basal five segments are reddish brown, and the remaining segments are black. The Legs are light yellow, with tarsi that are slightly tinged with black.  Head is smooth, with a frons with a shallow and short longitudinal groove, and sparsely and coarsely punctated. The eyes are kidney shaped. The Clypeus is triangular, finely and transversely wrinkled, with an anterior margin that is slightly arcuately emarginated and a posterior margin that is strongly concave. The antennae reach twothirds of the region of the elytra. The first segment is clubbed and the second is oblong. The third through fifth are slender, with the third as long as the fourth, longer than the second, and shorter than the fifth. From the sixth 6th segment on, they are somewhat broadened and flattened, with a terminal segment that is pointed apically.
Pronotum ( Figure 8A) is smooth and shining, distinctly vaulted, with a base that is broader than the apex. The basal width is about 1.6 times the length of the lateral margins. The anterior margin is slightly arcuate. The lateral are margins narrow. In the dorsal view, one-fourth of the basal part is visible. The posterior margin is weakly serrated and undulated. The scutellum is triangular, as broad as it is long, apically slightly elevated, and impunctated. Elytra ( Figure 8A) is oblong, with an apex that is slightly wider than the base, more than twice as long as it is broad, rounded apically, and weakly sinuated laterally in the dorsal view. The elytral humeri are distinct and slightly elevated. There is a Disc with regular rows of punctures: two lateral punctural rows with a groove, punctures that are getting slightly finer towards the apex, interspaces that are flat, with scattered, minute punctures between the rows, and epipleura that is weakly obliquely visible in the lateral view.
Prosternum ( Figure 1K,L) is longer than it is wide, with small and nearly round protrusions, an apical margin that is concave, and hind angles that are nearly round. The mesoventrite ( Figure 1K,L) is long, 1.3 times as long as it is wide, wrinkled, with a basal margin that is slightly concave and hind angles that are round. The metaventrite is coarsely and densely punctated and wrinkled. The pygidium has fine punctures and a short pubescence.
Aedeagus ( Figure 8D-F and Figure 9A-C) is elongated, about 3.7 times as long as it is wide, and moderately bent. The apex is prolonged into three processes. The dorsal process is broadly triangular, with an apex that is slightly acute. The ventral processes are broad and oblong. They are medial of the ventral processes with a dense, long pubescence. The tegmen is Y-shaped, weakly sclerotized, almost translucent, and bifurcate at the basal three-sevenths.
Female. Body more robust than male. Spermatheca ( Figures 8C and 9D) are hook shaped, slender, and strongly acute at the apex. The rectal sclerites are strongly sclerotized and not connected between the two clubbed sclerites on the ventral side.
The distribution is China (Sichuan). Diagnosis. This new species is similar to C. (Burlinius) elegantulus Gravenhorst, but can be distinguished by the dorsum being entirely black, the pronotum being smooth and impunctated, and the dorsal process of the aedeagus being more broad.
Etymology. The specific epithet is derived from Latin words "glabr-" and "elegantulus", to indicate the new species with a glabrous pronotum and near to C. (Burlinius) elegantulus.           Remarks. This species was described by M. Pic from Yunnan. After studying the syntype specimen from USNM and a lot of specimens kept in IZ-CAS, we believe it doubtlessly belongs to the subgenus Burlinius based on the following characteristics: The length of the body ( Figure 17A) is 2.5-2.8 mm and the aedeagus ( Figure 17D-F, Figure 18A-C) is apically prolonged into three processes.
There was no material examined. The distribution is China (Tibet).      Remarks. This species was described originally by Professor J.J. Tan from Yunnan. After studying the holotype from IZ-CAS, we found that it definitely belongs to the subgenus Burlinius, for the following reasons: The length of body ( Figure 29A) is 2.5-3.0 mm, nearly only half of last tarsomeron is free, and the aedeagus ( Figure 29D-F, Figure 30A-C) is apically prolonged into three processes.
The distribution is China (Yunnan).   Remarks. This species was described by Professor J.J. Tan from Yunnan. After studying the holotype specimen in IZ-CAS, we concluded that it doubtlessly belongs to the subgenus Burlinius: The length of its body ( Figure 31A) is 2.3-2.8 mm, less than half of the last tarsomeron is free, and the aedeagus ( Figure 31C-E, Figure 32A-C) is apically prolonged into three processes.
The distribution is China (Yunnan).   Remarks. This species was described by Gressitt and Kimoto from Fujian. After studying the specimens in IZ-CAS, we found that it doubtlessly belongs to the subgenus Burlinius based on the following characteristics: The length of its body ( Figure 33A) is 2.7-3.2 mm, nearly less than half of the last tarsomeron is free and the aedeagus ( Figure 33D-F, Figure 34A-C) is apically prolonged into three processes.
The distribution is China (Fujian, Gansu, Hubei, Sichuan).  Remarks. This species, Cryptocephalus (Burlinius) turpis Chen, was once considered as a synonym of Cryptocephalus nigrofasciatus Jacoby. After carefully comparing the specimens of both species (see color photographs in Figures 24 and 35), we concluded that they are two different species.
The distribution is China (Jilin).     Remarks. This species was described by Professor S. Chen from Jiangxi and it was later erroneously synonymized under C. (Burlinius) elegantulus [6]. After studying the holotype in IZ-CAS, we found that it is a valid species according to the following characteristics: Its upper side has a lightly yellow marking, the prosternum ( Figure 1O,P) is wider and covered with coarse punctures, and its basal margin is curved, as shown in Figure 1O,P, the aedeagus ( Figure 37D-F and Figure 38A,B) is fusiform and more acute than in C. elegantulus. Moreover, this species was also considered by Medvedev, 1992 [49], as a synonym of C. bilineatus (Linnaeus, 1767) [13], but the latter has the pronotum that is impunctated, the prosternum ( Figure 1G-H) that is tinged with a yellow mark, a nearly straight basal margin, and three processes of the aedeagus ( Figure 9D-F and Figure 10A-C) are more separated. The distribution is China (Zhejiang, Fujian, Jiangxi, Hubei, Gansu).

Discussion
This study reports our results of the taxonomic study on the subgenus Burlinius Lopatin, 1965, a leaf beetle group of the megadiverse Cryptocephalus Geoffroy. The paper includes four new species and one revalidated species. Another four species were transferred to this subgenus and, thus, get a new taxonomic status. As an intensive taxonomic work, this study increases the number of species of the subgenus Burlinius to a total of 26 species in the territory of China. A key to all the Chinese species is provided. These results are, of course, the new contributions to the Chinese fauna of this and/or other leaf beetle taxa. This represents a definite and obvious progress, which may promote the advances in the investigations on systematics, phylogeny, and zoogeography of the large subfamily Cryptocephalinae in the future.
As we pointed out before, the subgenus Burlinius Lopatin, 1965 [1], is a special leaf beetle group within the megadiverse genus Cryptocephalus Geoffroy, 1762 [2] (Coleoptera, Chrysomelidae, Cryptocephalinae, Cryptocephalini). Two special difficulties challenged this study: It concerns genus-level taxa of megadiversity (ca. 2000 species in total) and the taxonomic history nested within each other [1][2][3][4]50]. Indeed, the subgenus Burlinius was created by Lopatin (1965), based on the type of species Chrysomela fulva Goeze, 1777 [3], and included merely 52 species then, which were originally in the genus Cryptocephalus Geoffroy but had not yet been assigned to any subgenus. Warchałowski (2010) increased the number to 94 species and subdivided them into four different species group [5]. Lopatin et al. (2010) catalogued a number of 121 species and another 10 subspecies in this subgenus [4]. Before this study, the subgenus Burlinius Lopatin included 128 species, which were distributed mainly in the Palearctic region [1,4,5] (Lopatin, 1965;Warchałowski, 2010;Lopatin et al., 2010). The new species' descriptions and other known species' revision we completed here provide new contributions to this megadiverse taxon.
Of the Chinese fauna, Chen (1942) [6] studied the Chinese Cryptocephalus and Gressitt and Kimoto (1961) [7] revised the whole leaf beetles of China and Korea. Thirteen Chinese species of the subgenus Burlinius were included in these studies, but they are not assigned to any subgenus yet. The subgenus-level designation was down most recently and a total of 19 species of Burlinius were found to occur in China (Lopatin et al., 2010) [4]. As a matter of fact, there was no important species finding with respect to Chinese Fauna of the subgenus Burlinius in the last several decades; taxonomic contribution (if any) included merely categorizing known species to the right subgenus. In addition to new species' description, our study revises all the Chinese species of the Burlinius. Moreover, a key to all Chinese species of Burlinius is also given in the paper, as well as the well-prepared color illustrations and line drawings. The genital structures were based upon the specimen digestion provided in the paper, and these are especially important to this (and maybe most other) leaf beetle taxon, for the early publications did not provide genital characteristics.
Our study concentrated, of course, on the species-level taxonomy of the subgenus Burlinius, with its particular emphasis focused on the fauna of China, a country with a very large territory and high biodiversity in the world and of great importance to fill the gap in word species' inventories. Our results increase the species' number of the subgenus Burlinius to 26 in total of the Chinese species. This is surely an important taxonomic contribution and may be of biological and systematic significance in filling gaps in the faunistic composition of the genus Cryptocephalus Geoffroy in China. This study is also a new one of our series of studies on the leaf beetle subfamily Cryptocephalinae (including Cryptocephalini and Clytrini) [50][51][52][53][54][55][56].