Differs from congeners in the combination of dark brown mesonotum and male T1-2 brown microtomentose, T3-5 silvery microtomentose except for brown posterolateral corner of T5.
Male coloration and vestiture: frons brown, ocellar triangle and orbital plates brown microtomentose, lunule dark brown, basoflagellomere black, face silvery microtomentose, palpus black; thorax with mesonotum dark brown microtomentose, scutellum same, pleura more greyish microtomentose, wing hyaline, veins brown, brown spot at tip of vein R1 weak, calypter light brown with brown margin, halter black, legs black, fore and hind tarsus with dark brown brush; abdomen with T1-2 brown microtomentose, T3-5 silvery microtomentose except for brown posterolateral corner of T5.
Morphology. Head: frons with 2 orbital and 2 frontal setae, anterior frontal seta medioclinate. In males frons 1.9x as wide at posterior margin than at base of antenna, arista about 4.7x as long as basoflagellomere wide, pubescence on arista very short, posterior eye margin without notch but emargination (4oc).
Thorax: 3+1 dc, 4+1 prsc, 1 pprn, 1+0.7 prs and row of short setae, 1+0.7+0.7 keps setae, posterior prsc about as long as posterior dc, seta between posterior prsc and posterior dc absent. Wing with vein R4+5 and M1 converging (2.6), and ultimate section of vein M1 2.3x as long as penultimate section. Fore femur strongly setulose, tibial organ absent.
Male abdomen: posteromedial triangular projection of T1 into T2 present. Tergal chaetotaxy: T2 anterolateral corner with more than 3 lines of setae, T2 with hairs at posterior margin, T3-4 with very scarce setulae at posterior margin, T5 with setulae at posterior margin and lateral sides;. S5 1.3x as long as wide, 2.1x as long and 2.6x as wide as S4, strongly setulose. Male genitalia with apical seta on cercus longer than epandrial setae, 1 seta on subepandrial plate, surstylus 1.0x as long as epandrium high, bent posteriorly, dilated apically (1.6x), with small edentation at posterior base of dilation, 7.5x as long as wide, structure of lateral surface smooth, medial surface with long setulae along anterior margin.
Special characters: all setulae long; mesonotum with only few setulae; mid femur with long setae antero- and posteroventrally in male; T2 in male short, T3 on median line about 6-7x as long as T2, silvery microtomentum very long.
Body length: 2.5-3.2 mm; wing length: 2.8-3.6 mm.
Species in the mollis-group are characterized by the combination of posterior orbital seta absent, ocellar triangle and orbital plates brown microtomentose, mesonotum brown microtomentose and usually with few acrostical setulae, 3+1 dc, 1 pprn, more than 1 prs, calypter margin brown, S5 between sickle moon and roundish shape, posterior margin not round but more straight with slight angle, with long setae, surstylus as long or longer than epandrium high, narrow, tip with preapical posterior edentations.
Description of puparium of a species probably belonging to the mollis-group:
Puparium elongate, tapering towards anterior and posterior end. Empty puparium yellow brown, shiny to subshiny, with distinct borders between segments. Anterior (thoracic) part dorsoventrally compressed. All thoracic segments sculptured by distinctive, mostly transverse ribs; prothoracic segment at least ventrally with more conspicuous ribbed sculpture. Abdominal segments circled by very fine ribs or wrinkles, ventrally each with 1-2 transverse rows of very minute spinulae. Posterior end of puparium more convex and strongly transversely or reticularly (last segment) ribbed. Posterior spiracles borne on widely-separated protuberances; each spiracle composed of 3 very long yellowish brown, finger-like projections, which appear to be fused or sheathed within a membrane on basal half.