ments with short golden yellow hairs intermixed, and on the yellowish 

 spots on the third segment no trace of the yellow pubescence ; the 

 sides of the abdomen blackish except the first segment yellow, furnished 

 with a rather short (but slightly longer than that on the disc) yellow 

 pubescence. Ventre slightly shining ; the basal two segments yellow, 

 sometimes bearing a greyish irregular spot at the middle of each seg- 

 ment ; third segment mostly yellowish, usually slightly tinged with 

 reddish, the lateral margins and posterior border brown or blackish ; 

 the following ones black but slightly obscured by a yellow tomentum 

 especially conspicuous at the lateral and posterior borders of each 

 segment ; pubescence rather dense and short, golden yellow. 



Length : 9-11 mm. 



Male. Distinctly distinguished from the famale by the blackish 

 markings on both the wings and abdomen. 



Head about as wide as the thorax. Frons somewhat long, 

 mostly black and shining but the antennal protuberance (which is 

 distinctly separated by a blackish groove between the antennae) covered 

 with a greyish dust leaving around the antennal insertions quite bare ; 

 vertex black, somewhat tinged with brown, less prominent and lower 

 than in all of our species of the genus, bearing a few rather long 

 blackish hairs on the anterior half, and with a few long overhanging 

 yellowish fringe behind; occiput slightly convex, black but somewhat 

 obscured by a yellow dust, bearing a few blackish hairs on the upper 

 part just below the vertex. Face convex more than in the female ; 

 the intermediate yellow line much narrower than in the female, extend- 

 ing from the upper mouth-edge to just below the antenannae, and 

 slightly but suddenly broadened at just before transverse suture below 

 the anntenae ; facial calli much larger, somewhat pentagonal, reaching 

 to both the eye-margin and antennal tubercle at the upper-outer angle ; 

 oral calli rather small, each somewhat elliptical, fused with the lower 

 margin of the facial callus and expanding to just inside of the incons- 

 picuous longitudinal furrow extended from the facial deep pit to the 



