5. Platystethus dilutipennis Cameron, 1914

(Figs. 12 & 13)

Cameron, 1914: 527 (Type locality: S. India: Nilgiri Hills, 3500 feet); Cameron, 1930: 266 (characters; India); Zheng, 1998: 253 (China); Herman, 2001a: 1480; Smetana, 2004: 518 (subgenus Craetopycrus); Yan, Li & Zheng, 2012: 342, 343 (China).

Material examined. 183 specimens, 73♂♂, 110♀♀. CHINA: Hubei, Shenlongjia: 1♂, Hongshitougou, 1870m, pitfall trap, 1998. VII.28–VIII.10, H.-Z. Zhou leg. (IZ-CAS); 1♀, Guanmenshan [=Mt. Guanmen, 31.43ºN 110.37ºE], 1500 m, pitfall trap, 1998. VII.23–30, H.-S. Zhou leg. (IZ-CAS). Sichuan: 1♂, Baoxingxian [=Baoxing Co.], Pujigou, 2200 m, coniferous and broad leaf forest, pitfall trap, 2003. VIII.11–14, X.-D. Yu leg. (IZ-CAS); 1♀, Wolong [31.03ºN 103.18ºE], Wulidun, 2395 m, artificial larch forest, pitfall trap, 2004. VIII.6–9, X.-D. Yu leg. (IZ- CAS); 1♀, same data as previous except: 2585m, edge of regenerating forest, 2004. VII.21–24 (IZ-CAS); 1♀, same data as previous except: 2004. VIII.5–8 (IZ-CAS); 1♀, Wolong, Wuyipeng, 2545 m, birch forest, pitfall trap, 2004. VII.29–VIII.14, X.-D. Yu leg. (IZ-CAS); 1♀, same data as previous except: 2630 m, Rhododendron forest, 2004. VIII.14–29 (IZ-CAS); 1♀, Wolong, Wuyipeng, Yuancaodi, 2400 m, regenerating forest, 2004. VII.1–16, X.- D. Yu leg. (IZ-CAS); Erlangshan [=Mt. Erlang], 1♀, 2600 m, coniferous and broad leaf forest, pitfall trap, 2001. VII.6–7, X.-D. Yu & H.-Z. Zhou legg. (IZ-CAS). Yunnan, Jingdongxian, Ailaoshan [=Mt. Ailao]: 1♀, Ailaoshan station, 24º32.678'N 101º01.675'E, 2486 m, cow dung, 2010. IX.17, Y.-L. Zhou leg. (IZ-CAS); 2♀♀, South of the Ailaoshan station, 24º32.951'N 101º01.656'E, 2500 m, flight interception trap, 2010. IX.15–16, Y.-L. Zhou leg. (IZ-CAS); 1♂, same data as previous except: 2010. IX.17 (IZ-CAS); 1♂, same data as previous except: 2010. IX.21 (IZ-CAS); 1♂, 1♀, South of the Ailaoshan station, 24º32.359'N 101º01.668'E, 2485–2520 m, forest litter, sifting, 2010. IX.17, Y.-L. Zhou leg. (IZ-CAS); 1♂, 1♀, same data as previous except: 2440–2485 m, pitfall trap, 2010. IX.17, Y.-L. Zhou & L. Lü legg. (IZ-CAS); 4♂♂, 5♀♀, same data as previous except: 2010. IX.18, L. Lü & X. Zhang legg. (IZ-CAS); 2♂♂, 2♀♀, same data as previous except: 2010. IX.20 (IZ-CAS); 13♂♂, 17♀♀, South of the Ailaoshan station, 24º32.36'N 101º01.67'E, 2450–2465m, pitfall trap, 2010. IX.18, L. Lü & X. Zhang legg. (IZ-CAS); 15♂♂, 18♀♀, same data as previous except: 2482–2520m (IZ-CAS); 8♂♂, 8♀♀, same data as previous except: 2475–2480 m (IZ-CAS); 1♂, same data as previous except: 2010. IX.20 (IZ-CAS); 2♂♂, 4♀♀, South of the Ailaoshan station, 24º32.682'N 101º01.668'E, 2513 m, flight interception trap, 2010. IX.19, Y.-L. Zhou & X. Zhang legg. (IZ-CAS); 1♀, same data as previous except: 2010. IX.21 (IZ-CAS); 2♂♂, 3♀♀, North of the Ailaoshan station, 24º32.806'N 101º01.665'E, 2485m, tea plantation, pitfall trap, 2010. IX.20, L. Lü & X. Zhang legg. (IZ-CAS); 2♂♂, 8♀♀, East of the Ailaoshan station, 24º32.94'N 101º02.27'E, 2465 m, pitfall trap, 2010. IX.22, L. Lü & X. Zhang legg. (IZ-CAS); 4♂♂, 9♀♀, same data as previous except: 2470 m (IZ-CAS); 4♂♂, 5♀♀, same data as previous except: 2580 m (IZ-CAS); 4♂♂, 5♀♀, same data as previous except: 2490 m (IZ- CAS); 6♂♂, 8♀♀, Xujiaba reservoir, 24º32.411'N 101º01.012'E, 2440m, flight interception trap, 2010. IX.22, Y.-L. Zhou leg. (IZ-CAS). Yunnan, Menglaxian: 2♀♀, Yaoqu, 21º43.850'N 101º30.953'E, 1150m, pitfall trap, 2010. X.3, X. Zhang & L. Lü legg. (IZ-CAS). Zhejiang: 1♀, Kaihuaxian [=Kaihua Co.], Gutianshan [=Mt. Gutian] Nature Reserve [29.24ºN 118.11ºE], 446–715m, coniferous and broad leaf forest, pitfall trap, 2010. V.1–4, C.-L. Liu leg. (IZ-CAS); 1♀, Qingyuanxian [=Qingyuan Co.], Baishanzu Nature Reserve [27.75ºN 119.21ºE], 1300m, 1994. VII.16, H. Wu leg. (IZ-CAS).

Redescription. Body shiny and black; mandibles, maxillary palpi (articles 1–3), legs reddish brown; maxillary palpi (apical article) yellow; elytra yellowish pale, transparent, with base and apex infuscate. Length [average]: ♂, 4.4 mm; ♀, 4.5 mm.

Male. Head (Figs. 12 A; 13A) broadest at eyes and temples. Disc flat, less pubescent, with punctures and micro-striae fine but dense in middle. Clypeus with surface delicate and not punctate, protruding beyond anterior border of supra-antennal ridges, anterior margin with tiny tooth in center, beside which furnished with a pair of sharp and long spines connected by semicircular elevation at base. Epistomal suture invisible. Supra-antennal ridges elevated. Vertex sloped anteriorly, without mid-longitudinal suture, paralateral sutures obliquely running from middle of head to each 1/3 of occipital suture. Eyes convex, equal with temples in length, with coarse facets; orbital sulcus remarkable. Temple dilated laterally. Neck constricted, and demarcated by occipital suture, surface delicate in dorsal center but coriaceous in lateral areas. Occipital suture integral and slightly curved. Mandible (Fig. 13 A) long and stout (short in some male individuals, Fig. 13 C), sharp, and incurved; bearing 3 teeth on inner edge: front one large, other two tiny.

Pronotum (Figs. 12 A; 13A) narrower than head, widest at anterior 1/4, with mid-longitudinal sulcus and micro-striae absent, with large punctures sparse but clustered; anterior margin broadly emarginate, anterior lateral angles less prominent, nearly no posterior angles; lateral and posterior margins integrated and evenly rounded, without crenulation, near lateral margin with shallow punctate depression. Scutellum with crest-shaped impression. Elytra with posterior margin obliquely truncate, elytral suture dehiscent or partly overlapping.

Abdominal sternite VII (Figs. 12 C; 13E) with posterior margin emarginate in middle, where modified by semicircular membrane. Sternite VIII (Figs. 12 D; 13F) posterior margin broadly rounded and with two small processes near middle, behind which situated with two short spinules; subbasal ridges continuous in middle.

Aedeagus (Figs. 12 G–I; 13I –K) with median lobe a little inflated at base; apical orifice large, closed at apex by two overlapping petal-like pieces, ventrally fissured to apical 1/3 of ventral surface, edges of ventral fissure protruding into a pair of long spines, slightly outcurved; internal sac membranous, not rolling. Paramere arm-like; basal arm with furrow; apical arm slightly explanate, furnished with two setae at apex, with one short process at near apex of ventral edge, where with short seta.

Female. Head (Figs. 12 B; 13B) smaller than male, not wider than pronotum; clypeus with spines reduced into teeth, depressed and emarginate between teeth. Eyes longer than temples. Mandibles (Fig. 13 D) smaller. Pronotum widest at apical 1/3. Abdominal sternite VII without modification, sternite VIII (Figs. 12 E; 13G) gradually narrowed with posterior margin broadly rounded.

Spermatheca (Figs. 12 F; 13H) with basal part inflated, and V-shaped constricted near base; apical part slender and curved.

Distribution. China (Hubei, Sichuan, Yunnan, Zhejiang); India.