70 



iovvnish parts almost entirely yellowish and suberect, but on the last 

 4 segments and posterior margin of the third segment with somewhat 

 numerous, suberect, and pale yellowish hairs intermixed. Ventre lighter 

 than the dorsum, slightly coverd with a greyish yellow dust, moderately 

 convex but slightly concave posteriorly, the basal two segments and 

 anterior margin of the third segment pale yellowish white, the remain- 

 ing segments pale brownish black, gradually darkened towards the anal 

 end, very often at the side of the second segment with an inconspicuous 

 pale brown longitudinal stripe, and in the specimens from Hokkaido a 

 small brownish stripe at the middle of the second segment ; pubescence 

 rather dense, very fine and depressed, pale yellowish white but on the 

 blackish part with a very numerous very short brown pubescence. 



Length : 9-9.8 mm. 



Male. Smaller than the female and distinguished from the 

 female by the yellow marking on the abJomen as well as by the 

 blackish base of the wings. 



Head rather small, but slightly broader than the thorax. Fron.s 

 rather long and narrow, with the moderately broad antennal tubercle 

 which has a fine groove between the antennal bases but it is not 

 reaching towards the face, so that the tubercle is not entirely separated 

 by the groove, brownish somewhat shining but on the antennal tubercle 

 with greyish dust, quite bare from pubescence, on the middle with a 

 small but conspicuous longitudinal carina ; vertex entirely occupied by 

 the ocelligerous tubercle, which is much prominent and is blackish but 

 very slightly obscured by a greyish yellow tomentum, and which is 

 bearing a few long brownish black hairs on the anterior half and has 

 also a very few much longer overhanging brownish fringe behind ; occiput 

 very slightly convex but slightly sunk from the back of the head, blackish 

 but distinctly dusted with greyish yellow, on the upper border just 

 below the vertex bearing a few moderately long yellowish fringe which is 

 somewhat overhanging the posterior margin of the oceUigerous tubercle. 

 Face convex very slightly more than in the female, the upper part 



