The genus Trachionus Haliday, 1833 (Hymenoptera, Braconidae, Alysiinae) new for China, with description of four new species Author Cui, Qian Author van Achterberg, Cornelis Author Tan, Jiang-Li Author Chen, Xue-Xin text ZooKeys 2015 512 19 37 http://dx.doi.org/10.3897/zookeys.512.9759 journal article http://dx.doi.org/10.3897/zookeys.512.9759 1313-2970-512-19 DF784B4CE8344A50A0BFD07CB72BD009 DF784B4CE8344A50A0BFD07CB72BD009 Taxon classification Animalia Hymenoptera Braconidae Trachionus brevisulcatus Cui & van Achterberg sp. n. Figs 22, 23-32, 45 Type material. Holotype, ♀ (NWUX), "NW. China: Shaanxi, Pingheliang, Ningshan, c. 2000 m, 27.vi.2011, 33°48'N , 108°50'E , Jiangli Tan, NWUX". Paratypes (ZJUH, RMNH): 4 ♀, topotypic and same date. Diagnosis. Scutellum largely smooth, at most punctulate and nearly flat; mandible black, medially with irregular transverse crest and with minute fourth and fifth teeth (Figs 28, 30, 45); temple smooth and medium-sized (Fig. 29); propleuron without transverse carina subposteriorly; sternaulus absent; median groove of mesoscutum and notauli wide posteriorly; metanotal spine medium-sized, its highest point remaining below level of tips of setae of scutellum (Fig. 32); propodeum angularly lowered posteriorly in lateral view and carina hardly protruding postero-laterally (Fig. 25); transverse carina of propodeum coarsely developed and irregular; medial third of hind tibia brownish yellow; basal half of second metasomal tergite coarsely rugose-striate, with about 30 striae and very shiny (Fig. 26); rugae of third tergite with distinct shiny interspaces. Similar to Trachionus hians , but this species has a strong transverse carina at the propleuron subposteriorly (without transverse carina in Trachionus brevisulcatus ) and basal half of second metasomal tergite largely finely aciculate (basal half of second tergite moderately striate). Description. Holotype, female; body length 3.5 mm, forewing length 3.5 mm. Head. Width of head 2.1 x its median length, head dorsally smooth, strongly shiny and largely sparsely setose; antenna with 37 segments,1.2 x longer than fore wing, third segment 1.3 x as long as fourth segment, length of third, fourth and penultimate segments 2.9 x , 2.3 x and 1.4 x their width, respectively; frons slightly depressed behind antennal sockets and smooth; eye in dorsal view 2.2 x as long as temple; temple in dorsal view directly roundly narrowed, smooth and near mandible punctulate; OOL: diameter of ocellus: POL= 10:3:3; face weakly convex, with long downward pointing setae laterally, punctulate and largely smooth; clypeus hemi-circular, smooth with some fine punctures and convex; eye glabrous; mandible nearly touching eye, length of malar space less than 0.1 x basal width of mandible; mandible 1.1 x as long as its maximum width and 1.2 x as long as its basal width, largely rugose medially and basally; mandible with irregular transverse crest, two wide lateral lobes and minute ventral fourth and fifth teeth; maxillary palp as long as height of head. Mesosoma. Length of mesosoma 1.5 x its height; pronotum laterally punctate; propleuron without transverse carina subposteriorly; epicnemial area largely punctate; precoxal sulcus complete, wide and coarsely crenulate; sternaulus absent; remainder of mesopleuron smooth, but dorsally punctate; episternal scrobe large; pleural sulcus finely crenulate; mesosternal sulcus medium-sized and moderately crenulate, posteriorly widely reticulate; metapleuron narrowly smooth anteriorly and mainly coarsely punctate-reticulate ; notauli deep and completely crenulate, united medio-posteriorly in wider reticulate area; median groove of mesoscutum complete and crenulate, mesoscutum smooth, shiny and only anterior half of middle lobe and area near notauli setose; scutellar sulcus very deep and with 3 longitudinal carinae, 0.4 x as long as scutellum; scutellum largely smooth, with few fine punctures and nearly flat; metanotal spine medium-sized, its highest point remaining below level of tips of setae of scutellum (Fig. 32); propodeum angularly lowered posteriorly in lateral view and carina hardly protruding postero-laterally (Fig. 25); transverse carina of propodeum coarsely developed and irregular; surface of propodeum mostly reticulate and medio-longitudinal carina present anteriorly. Wings. Pterostigma elliptical; marginal cell of forewing elongate; vein r issued after middle of pterostigma (Fig. 23); r:2-SR:3-SR+SR1 = 6:10:42; SR1 curved; 1-CU1:2-CU1 = 2:19; CU1b present; m-cu antefurcal; 1-CU1 hardly widened; M+CU1 sclerotized. Hind wing: M+CU:1-M:1r-m = 33:14:20; cu-a straight; m-cu vaguely indicated. Legs. Hind coxa largely smooth and with long setae; tarsal claws medium-sized (Fig. 31); length of femur, tibia and basitarsus of hind leg 3.7, 6.0 and 3.9 x their width, respectively; all femora widened. Metasoma. Length of first tergite 1.1 x its apical width, its surface punctate-rugose, with dorsal carinae converging medially and united in distinct median carina (Fig. 26); second tergite strongly rugose; basal half of third metasomal tergite moderately striate and strongly shiny, remainder smooth; combined length of second and third metasomal tergites 0.7 x total length of metasoma (Figs 26-27); rugae of third metasomal tergite with distinct shiny interspaces; setose part of ovipositor sheath 0.1 x as long as fore wing; hypopygium large and apically acute (Fig. 27). Colour. Black (including mandible); palpi, tegulae and legs yellow, but tarsi and base of coxa darkened; hypopygium partly brown; pterostigma and veins dark brown; wing membrane slightly infuscate. Variation. Forewing length 3.5-3.6 mm, body length 3.5-3.9 mm; antenna 35 (1 ♀), 36 (1 ♀) and 37 (1 ♀) segments; hypopygium largely brownish yellow or dark brown. Distribution. China (Shaanxi). Etymology. The name is derived from "brevis" (Latin for "short" ) and "sulcus" (Latin for "groove" ) because of the short widened parts of precoxal sulcus and notauli.