Male. Head and thorax shiny black wiith slight brown shading on the pleural sutures. Abdomen dorsally deep black-brown with the anterior portion of segments 4-7 faintly pale, hyaline, and with traces of a broken dark supraspiracular band; ventrally scarcely paler with similar hyaline areas and traces of small black spots in the postero-lateral corners of the middle segments. Legs deep brown Setae dirty white ringed with dark brown. Wings hyaline with pale brown longitudinal veins; the crossveins pale, except in the costo-apical region. Length of body 7 mm.; of wings 7 mm.

Male grayish; head densely grayish pollinose with reddish black reflections; frontal vitta opaque black, viewed from below with grayish pruinescence; antennae with second segment obscurely reddish apicad, third segment blackish: palpi blackish ; proboscis lightly pollinose. Thorax grayish pollinose, with black reflections; viewed from the side, the mesonotum with three brownish vittae. Abdomen more densely grayish pollinose, with dark reflections, each tergum has a broad subtriangular fuscous mark. Legs blackish, tibiae obscurely reddish, pulvilli tinged. Wings clear ; veins yellowish brown ; calyptrae tinged ; halteres yellow.

Male.—Length 10 mm.; antenna 8 mm.

Head shining; vertex feebly convex ; front with sparse weak punctures Malar space scarcely one-fourth as long as basal width of mandible. Thorax shining; sparse weak punctures on dorsal third of pronotum, meso-scutum, scutellum, anterior half of mesopleura, mesosternum and metapleura; propodeum with distinct rather dense punctures except for polished mid-dorsal area where punctures are obsolete.