Body length. 10.0-15.0 mm. Male. Head with yellowish gray pruinosity, frontal vitta brownish black, lunule brown; antennae and palpi reddish yellow. Frons 1/6-1/7 as wide as head width; fronto-orbital plate slightly wider than or subequal in width to frontal vitta at middle; parafacial 2.5-3 times as wide as 1st flagellomere; facial carina developed, ridge arched in lateral view, widened below; lower margin of face protruding forward; gena about 3/7 as wide as eye height. Inner vertical seta 0.27-0.4 times as long as eye height, about twice as long as fine, hair-like, outer vertical seta; ocellar seta as strong as upper frontal setae; 12-13 inclinate frontal setae; vibrissa inserted above lower margin of face. Antenna falling short of lower margin of face by 0.6-0.7 times length of 1st flagellomere, latter about 4 times as long as pedicel; total width of arista including plumosity about 4 times as wide as 1st flagellomere. Prementum 5-6 times as long as wide; palpus slightly longer than antenna. Thorax black in ground color, with grayish yellow pruinosity, 4 longitudinal black vittae on presutural area of scutum and 5 on postsutural scutum, an inner vitta 0.4-0.5 times as wide as pruinose portion between inner and outer vittae on presutural area. All thoracic hairs black; prosternum bare, twice as long as wide;proepisternum bare; 1-2 presutural and 2 postsutural acrostichal setae; 3 presutural and 3 postsuturaldorsocentral setae; 2 postsutural intra-alar setae; 3 supra-alar setae, anterior seta about 1/2 as long as posterior two; 3 katepisternal setae. Wing brownish hyaline; basicosta black; tegula mostly black except reddish brown base; lower calypter yellowish, with short fringe on outer margin. Costal spine distinct, about as long as r-m crossvein; relative lengths of 2nd, 3rd and 4th costal sectors approximately 1:2:1; vein M from dm-cu crossvein to its bend 2.5-3.3 times distance between the bend and wing margin, appendix very short. Legs reddish yellow except for dark brown tarsi and brown ventrodistal portions of femora. Mid tibia with 2 posterodorsal setae; hind tibia with 1-3 anterodorsal, 2-3 posterodorsal and 2 ventral setae. Fore claw and pulvillus slightly longer than, or subequal in length to, tarsomere 5. Abdomen long ovate, translucent yellow, black on mid-dorsal longitudinal areas and on posterior 1/4-1/5of tergites 4 and 5, black marking on bases of lateral marginal setae of each tergites; grayish white pruinosity on narrow anterior margin of tergites 3, anterior 1/4-4/5 of tergite 4 and entire tergite 5. Syntergite 1+2 with 2 median marginal and 1 lateral marginal setae; tergite 3 with 1-2 pairs of median discal, 1 pair of median marginal and 1 lateral marginal setae; tergite 4 with 1-2 pairs of discal and a row of marginal setae; tergite 5 with a row of discal and marginal setae. Male terminalia. Sternite 5 subsquare, V-shaped median cleft about 3/5 length of the sternite, posterior lobe wide and blunt apically; cerci slender on apical half and pointedapically; surstylus narrow and slender, pointed apically; postgonite shorter than basiphallus. Female. Frons 0.28-0.33 times as wide as head width; frontal vitta slightly narrower than fronto-orbital plate at middle; 1st flagellomere about 5 times as long as pedicel. Tegula and basicosta brown to dark brown.Legs wholly yellow; claws and pulvilli short. Abdomen ovate; reddish yellow; tergites 4 and anterior half of tergite 5 black, with gray pruinosity; abdominal syntergite 1+2 without median marginal setae, tergites 3 and 4 without discal setae. Other characters almost same as in male.