Redescription.
Head including compound eyes slightly narrower than pronotum (Figs 3A, 7A). Vertex (Figs 3A, 7A) broad, shorter in midline than width at base; anterior margin ridged and distinctly arched anteriad, lateral carinae strongly elevated and subparallel, posterior margin carinate and angularly concave at about 100° angle, median carina distinct and complete; disc slightly depressed. Frons (Figs 3C, 7C) large and broad, convex in midline, longer than breadth, lateral margins weakly carinate, slightly converging below antennae; median carina broadly and strongly convex, intermediate carinae absent. Frontoclypeal suture (Figs 3B, C, 7B, C) distinct and straight. Clypeus (Figs 3C, 7C) about half as long as frons, median carina broadly and strongly convex. Rostrum (Figs 3C, 7C) very short and broad, reaching to middle coxae, apical segment short, as long as breadth, abruptly truncate and concave at apex. Compound eyes (Figs 3A–C, 7A–C) oval. Ocelli (Figs 3B, 7B) small, reddish, close to eye and away from base of antennae. Antennae (Figs 3A–C, 7A–C) with scape small, ring-like; pedicel cylindrical, covered with fine setulae and no more than 20 sensory plaque organs distributed in apical half.
Pronotum (Figs 3A–C, 7A–C) longer than vertex in midline, distinctly shorter than mesonotum in midline; anterior central part distinctly produced forwards with anterior margin keeled and strongly convex; disc large, strongly elevated, tricarinate and delimited by intermediate carinae, median and intermediate carinae complete and sharp, median carina with a lateral pit on each side; lateral marginal areas deeply concave with a longitudinal carina on each side from eye to tegula; posterior margin subangulately concave. Mesonotum (Figs 3A, 7A) clearly tricarinate on disc, lateral carinae incurving, converging anteriad, and reaching end of median carina. Forewings (Figs 3D, F, 7D) hyperpterous, narrow and long, membranous, without granulation, with nodal line (just past midlength); costal area present, narrower than costal cell, beyond level of tip of clavus, with numerous transverse veinlets; vein ScP+R forked basad before midlength and well basad nodal line, ScP+RA separated beyond nodal line; vein MP bifurcating into MP1+2 and MP3+4 at level of nodal line; vein CuA forked before ScP+R forking; Pcu and A1 veins fused into a long Pcu+A1 vein at apical 1/3 in clavus; number of apical cells between veins RA and CuA from 14 to 16. Hindwings (Figs 3E, G, 7E) hyaline, ScP+R, MP and CuA bifurcating only once; ScP+R and CuA bifurcating near apical third, anterior to bifurcation of MP; veins CuP and Pcu unbranched, running close and parallel at their base; vein A1 bifurcating into A1a and A1b near middle, A2 unbranched; transverse veinlets r-m and m-cua1 anterior to bifurcation of MP. Legs moderately long, hind tibia with four lateral spines (rarely three with the extreme basal spine absent) and seven apical teeth; hind tarsomere I with eight apical teeth and hind tarsomere II with two lateral apical teeth.
Male genitalia. Pygofer (Figs 4A–D, 8A–D), in lateral view (Figs 4A, B, 8A, B), much wider ventrally than dorsally, posterior margin more or less convex medially, without process, anterior margin produced in a pair of broad and large sclerotised processes ventrolaterally, inserted in former segment; in dorsal view (Figs 4C, 8C), dorsal margin slightly excavated to accommodate segment X. Gonostyles (Figs 4A, B, D, 8A, B, 8D) symmetrical, elongate, in ventral view (Figs 4D, 8D), inner margin more or less sinuate; in lateral view (Figs 4A, B, 8A, B), narrow at base, broadest in middle, gradually convergent and tapering toward apex, acute apically; dorsal margin irregularly sinuate, with a finger-like process raised from dorsolateral margin at base, directed dorsolaterad; outer dorsal edge with a hook-like process near basal third, directed caudad and curved ventrolaterad, acute at apex, twisted; outer ventral edge strongly carinate from base to apex. Periandrium (Figs 4E–H, 8E–H) symmetrical, moderately large, in lateral view (Figs 4F, G, 8F, G), reniform, compressed, its opening declined dorsoventrally, loosely attached to aedeagus basally. Aedeagus (Figs 4E–H, 8E–H) asymmetrical, elongate, cylindrical, sclerotised basally, and inflated apically, with four various sclerotised processes; in dorsal view (Figs 4E, 8E), two right processes produced on the membranous lobe: apical process elongate, tapering laterocaudad, basal one broad, triangular, pointed dorsocephalad; dorsal process small, somewhat triangular, directed dorsocephalad; left process large and broad, knife-like, directed laterocaudad. Segment X (Figs 4A–C, 8A–C) slender and elongate, in lateral view (Figs 4A, B, 8A, B), dorsal margin straight then declined ventrocaudad; ventral margin slightly incurved, lateroapical angles truncated apically; in dorsal view (Figs 4C, 8C), slender, expanded at base, narrowed in middle, apex deeply excavated to accommodate anal style, lateroapical angles strongly produced caudad. Anal style cylindrical, relatively small, not reaching to apex.
Female genitalia. Gonocoxae VIII (Figs 5B, C, E, G) with one membranous, slender, flattened endogonocoxal processes on endogonocoxal lobe. Gonapophyses VIII (Figs 5B, C, E, F) with anterior connective lamina strongly sclerotized, narrow and straight, in lateral view, tapering distad, with five minute teeth on dorsal margin, ventral margin slightly curved dorsad at apical fourth with three large blunt teeth. Gonapophyses IX (Figs 5G, H) converging apically, suddenly protruding laterad, truncate at apex. Gonoplacs (Figs 5A–C, I) fused at basal fourth, with two sclerotized lobes fully fused together and delimited by a longitudinal membranous suture: dorsal lobe elongate and tapering caudad, ventral lobe large, longer, apical part rounded, smooth. Segment X (Figs 5A, B, D, I) very small, in lateral view (Fig. 5I), triangular, broaden caudally, caudal margin reclined caudoventrad; in dorsal view (Fig. 5D), apex excavated to accommodate anal style. Anal style (Fig. 5D) relatively small, almost as long as length of caudal margin.