| The tribe Platyscelidini, belonging to the family Tenbrionidae, is a group with a significant meaning in agriculture and glassland. Since Lacordaire set up the tribe in 1859, 8 genera and 209 species have been recorded all over the world, among them, 4 genera and 71 species (subspecies) are distributed from China. It is a remarkably diverse fauna in China, however, the study on this group has been fallen far behind. The species of Platyscelidini from China are almost nominated and described by foreign scholars, only 5 species are found by native scholars. Nowadays there is still not completely systematic study of the Platyscelidini from China. In order to change this situation, I started to study this group three years ago.In the general account, status of the classification and hierarchy, review of classification research, material and methods, morphology, biology and economical importance, phylogenetic relationship, faunal composing and distribution are introduced in detail.In the classification account, 4 genera with 71 species (subspecies)from China are recorded, and synonyms, distributions of each species are listed. Among them, 37 species are depicted in morphological characters, which 37 habitus photographs and 347 figs are followed. Keys to genera and species are drawn up. During this study, 4 newspecies are described, All type specimens are preserved in the Museum of Hebei University. Furthermore, 2 subgenera and 4 species are reported for the first time from China, and a new synonym is found.The following abbreviations for descriptions are used in this paper: LA (the ratio of relative length of each segment of antenna from 2nd to 11th); PW/L (the ratio of the width and the length of pronotum); PB/A (the ratio of the length of base and the apex of pronotum); EL/W (the ratio of the length and the width of elytra); EW/PW (the ratio of the width of elytra and pronotum); EL/PL (the ratio of the length of elytra and pronotum); PRL/W (the ratio of relative length and width of protibia); LT (the ratio of relative length of each tibia); LPW (the ratio of relative width of each segment of protarsus from 1st to 4th ); LMW (the ratio of relative width of each segment of mesotarsus, from 1st to 4th); LMT (the ratio of relative length of each segment of metatarsus, from base to apex); PL/PL (the ratio of relative length of phallobase and paramere); PAL/W (the ratio of relative length and width of paramere).1. New species1.1 Myatis breipilosum Meng et Ren, 2005 (Tab.III: 6; Figs.: A-K)Male. Black, with feebly shining surface. Anterior margin of clypeus straight at sides, clypeal suture slightly concave; frons a little convex, densely and thickly punctured. Antenna reaching the base of pronotum; 2nd to 6th segments elongate cylindrical, somewhat dilated near apex; 9th to 10th segments almost moniliform; 11th segment elongato-oval; LA 19: 40: 26: 26: 28: 27: 29: 25: 24: 29. Pronotum broader, PW/L 41: 29, widest at anterior 1/3, and strongly narrowed toward anterior and parallel-sided toward base, PB/A 81: 52; front margin slightly concave; lateral margins finely bordered; basal margin nearly straight or somewhat bisinuous; front angles nearly rounded, hind angles nearly rectangular; disc with punctures sparse and small, somewhat thicker and denser near sides. Elytra a little wider than pronotum at base, EL/W 61: 41, EW/PW 41: 35, EL/PL 61: 23, widest at middle, with borders fine and evident only base in dorsal view; humeral angles round, not tooth-like; median sutureon elytra convex, both sides sharply declined, with punctures shallow and rounded, shallower near sides. Protibia gradually widened to apex, PRL/W 16: 5; LT 48: 43: 62; 1st to 4th segments of protarsus and mesotarsus somewhat expanded, LPW 15: 25: 21: 15, LMW 26: 40: 35: 22; LMT 18: 10: 9: 15. Propleuron with unregular wrinkles. Prosternal process without tooth. Mesosternum with thick punctures and wrinkles. Inter-coxal process of abdomen rounded; basal three segments of abdomen with longitudinal shallow concave at the middle; 5th segment with horizontal shallow concave, apical side rounded. PL/PL 43: 19, PAL/W 7:4, paramere weakly tapering from base to apex.Female. Antenna not reaching base of pronotum; protarsi and mesotarsi simple; other characters similar to the male.Body length: 9.5-11.2mm; width: 3.5-4.8mm.Holotype ♂, Zeku County, Qinghai China, 1996-VI-6, coll. Ren Guo-Dong. Paratypes: 12 ♂♂ , 4 ♀ ♀, same data as holotype; 3 ♂♂, 1 ♀, Qilian County, Qinghai China, 1996-VI-11, coll. Ren Guo-Dong.Distribution. China (Southeast of Qinghai Province)Diagnosis. This species is similar to My. schaferi Kaszab, 1940 from Eastern Xizang , but it can be distinguished from the latter mainly by the following characters: abdomen of male with short pubescence; mesotarsus very expanded; prosternal process devoid of tooth; body black; whereas in the latter 1st and 2nd segments of male abdomen with long yellow pubescence, mesotarsus slightly expanded, prosternal process with short round tooth and body brown to black.Etymology. This new species is named after short pubescence on male abdomen.1.2 Myatis nagquensis Meng et Ren, 2005 (Tab.III: 7; Figs.37: A-K)Male. Black, slightly shining. Anterior margin of clypeus straight at sides, clypeus suture slight concave; front very convex, with densely thick punctures. Antenna reaching the base of pronotum, from 2nd to 6th segments elongato-cylindrical, somewhat dilated near each apex; 9th to 10th segments nearly spherical; 11th segment elongato-oval; LA 16: 33: 22: 19: 21: 22: 22: 18: 19: 30. Pronotum wide, PW/L 3: 2, widest at middle, and narrowed in a straight line toward apex and almost parallel-sidedtoward base, bordered only at lateral sides, PB/A 10: 7; anterior margin slightly concave; lateral sides with fine and reflexed boarders; basal margin nearly straight or slightly bisinuous; anterior angles obtuse, proterior angles subrectangular; disc with small punctures, which are somewhat thicker near sides. Elytra a little wider than pronotum at base, widest at middle, with border fine, visible only base in dorsal view, EL/W 62: 47, EW/PW 47: 43, EL/PL 62: 23; humeral angles tooth-like; widest at middle, elytral margin fine and only visible basaly from dorsal view; median suture on elytra convex, both sides sharply declined; with punctures shallow and rounded, shallower near sides. Protibia widened toward apex, PRL/W 9: 4; LT 40: 39: 51; from 1st to 4th segments of protarsus and mesotarsus somewhat expanded, LPW 20: 43: 39: 26, LMW 21: 38: 31: 16; LMT 23: 15: 12: 25. Propleura with unregular wrinkles. Prosternal process not extended like tooth. Mesosternum covered with thick punctures and wrinkles. Inter-coxal process of abdomen rounded; anal segment nude, hemispherical, rounded at apex. PL/PL 7: 13, PAL/W 17: 10, paramere feebly tapering toward apex.Female. Antenna not reaching the base of pronotum; protarsus and mesotarsus not expanded.Body length: 7.0-8.0 mm; width: 3.2- 4.0 mm.Holotype S, Nagqu County, Xizang, China, 2002-VI-24, coll. BA Yi-Bin and YU Yang. Paratypes: 12 6 3, 13 ■?? -?, same data as the holotype.Distribution. China (Northern Xizang).Diagnosis. This new species is similar to M. schaferi Kaszab, 1940 from Eastern Xizang , but it can be distinguished from the latter mainly by the following characters: male abdomen with short pubescence; mesotarsus very expanded; prosternal process without tooth; body black; whereas in the latter 1 st and 2nd segments of male abdomen with long yellow pubescence; mesotarsus slightly expanded; prosternal process with a short rounded tooth; body brown to black. This new species is also similar to M. nagquana sp. nov., the distinction between them is shown in the key to the species.Etymology. This new species is named after the locality name of holotye.1.3 Bioramix {Leipopleura) qamdoana sp.nov. (Tab.HI: 8; Figs.38: A-J)Male. Black on color, foot and antenna brown, surface feebly shining. Head broad, Clypeus front margin straight, clypeus suture feeble curve; front head a little convex and with thick punctures. Antenna almost reaching base of pronotum, from 2nd to 6th segments elongate cylinder, near apex somewhat wide; 9th to 10th segments near sphere-shaped, 11th segment elongate egg- shaped; LA 13:18:13:12:13:13:13:12:12:14. Pronotum broader, PW/L 45:26, widest near front of base, and parallel contract toward base and anterior of pronotum; front side curve and basal side somewhat bisinuous, both lateral sides with fine bordered; front and basal cape near round; disc with dense and fine punctures, and near sides somewhat thick and the distance among punctures evidently larger than the diameter of punctures themselves. Elytra elongate egg-shaped, sharp convex, base wider than pronotum, EL/W 74:53, EL/PL 74:24; widest at middle, bordered fine and only base evident from dorsal view; elytra completely with sparse and shallow round punctures among which with fine wrinkle. Protibia gradually widen from base to apex, PRL/W 19: 9; LT 15:14:20; from 1st to 4th segment of protarsus and mesotarsus somewhat expend, LPW 10:25:23:17, LMW 12:21:18:11; LMT 10:6:4:7,. Propleuron with unregular wrinkles; prosteral process without protuberance. Mesosternum with rough punctures and wrinkle. Abdomen with pubes; inter-coxal process of abdomen obtuse angle and near round; apex margin of anal segment round. Genitalia length 4.6mm, PL/PL 8:21; PAL/W 7:3, paramere from base to apex shrink sharply, near apex gradually rough, lateral view 'S'-shaped. Female, protarsus and mesotarsus not expanded. Body length: 8.0mm; width: 4.0mmHolotype ￡, Changdu, Xizang Province, 1973-VIII-22, coll. Li Ji-Jun. Paratypes: 2 -? -? , same data as holotype.Distribution. China (Xizang Province)Diagnosis. This new species is similar to Bioramix (Leipopleura) micans (Reitter, 1889) from China inner-mongolia, Xizang and Qinghai Province, but it can be distinguished from the latter by following mainly characters: the former pronotum widest near base, apex margin curve; elytra widest at base; male genitalia length 4.6mm, paramere from base to apex shrink sharply, near apex gradually rough, lateral view 'S'-shaped. Then the latterpronotum widest at middle, apex margin straight; elytra widest at middle; male genitalia length 2.8~3.2mm, widest at base, paramere from baseto apex shrink slowly.Etymology. This new species is named for the specimens were collected from Qamdo, Xizang Province of China.1.4 Oodescelis (Ovaloodescelis) tachengensis sp. n. (Tab.I: 4; Figs.17: A-J)Male. Black on color, surface feebly shining. Head broad, Clypeus front margin straight, clypeus suture without curve; front head a little convex and with thick punctures. Antenna almost reaching base of pronotum, from 2nd to 9th segments elongate cylinder, near apex somewhat wide; 10th segments near sphere-shaped, 11th segment elongate egg- shaped; LA 8:20:15:12.5:14:14:13:13:12:17. Pronotum broader, PW/L 48:29, widest of base, and parallel contract toward anterior of pronotum; anterior margin straight; both lateral sides with fine bordered; posterior margin concave; front cape obtuse; basal cape acute; disc with smaller punctures, and near sides somewhat thick. Basal elytra wider than pronotum, EL/W 25:22, EL/PL 5:2; widest at base, parallel contract toward tail; bordered fine and only base evident from dorsal view; elytra completely with sparser punctures among which with fine wrinkle. Protibia gradually widen from base to apex, PRL/W 42:13; Metatibia curve and flat; from 1st to 4th segment of protarsus and mesotarsus somewhat expend, LPW 7:14:13:10, LMW 9:11:10:8; LMT 17:10:7, apex segment absent. Propleuron with unregular wrinkles; prosteral process without protuberance. Mesosternum with rough punctures and wrinkle. Inter-coxal process of abdomen acuminate angle. Genitalia length 3.0mm, PL/PL 84:35; PAL/W 19:11, paramere from base to middle shrink gradually, near apex broad and rough.Female, protarsus and mesotarsus not expanded.Body length: 8.0mm; width: 5.0mmHolotype &, Tacheng, Xizang Province, 1992-VIII-2, coll. Ren Guo-Dong.Distribution. China (Xizang Province )Diagnosis. This new species is similar to Oodescelis {Ovaloodescelis) qffinis Seidlitz, 1893 from China Xizang Province, but it can be distinguished from the latter by following mainly characters: the former body samll, length 8.0 mm; male genitalia length 3.0mm, paramere from base to middle shrink gradually, near apex broad and rough; metatibia curve and flat. Then the latter body large, length 9.0-12.0 mm; male genitalia length 4.5mm, paramere from base to middle shrink gradually, near apex parallel contract and rough; metatibia flat and without curve.Etymology. This new species is named for the specimens were collected from Tacheng, Xizang Province of China.2. New records2.1 Bioramix (Leipopleura) darbukensis (Kaszab, 1940);2.2 Bioramix (Platynoscelis) gracilis (Seidlitz, 1893);2.3 Bioramix (Pleioplatyscelis) lederi (Seidlitz, 1893);2.4 Bioramix (Pleioplatyscelis) caroli (Kaszab, 1940).3. New synonymy3.1 Platyscelis (Platyscelis) obovatus Ren, 1999 [=Bioramix (Leipopleura) micans (Reitter, 1889)].
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