m 



bearing very narrow but rather conspicuous ochraceous posterior mar- 

 gin on each segment ; pubescence short, whitish yellow nearly all 

 rather depressed^ but on the two basal segment bearing rather long 

 suberect yellowish ; hairs and also at the sides with similar pubes- 

 ccnce 1 . 1 ' ; ' . ; 



Length: . 9. 5-10. 2 mm. 



Male. Usually smaller than; the female, with more . darker 

 marking of the wings, and with much narrower lateral stripes of the 

 abdomen. 



Head conspicuously broader than the thorax. Face some- 

 what triangular, much covex, with a narrow intermediate yellowish 

 stripe which is extending to the upper mouth edge, at where oral 

 callus divided into two callosities ; buccal calli conspicuously trans- 

 verse, nearly touching the eye margin, from where it is gradually 

 narrowed towards the ' mouth edge and is not reached these ; pubes- 

 cence very long, mainly blackish, rather sparse, on the lower parts 

 of the face just above the buccal calli rather numerous and intermixed 

 with a few shorter whitish hairs, on the narrow line between the 

 facial calli very sparse, on the antennal protuberance quite bare ; 

 jowls covered with numerous long greyish yellow tawny hairs, not 

 being extended to the lower part of the back of the head. Frons 

 very small, triangular, quite bare, black and shining, but its lower half 

 obscured by yellowish tomentum, and the antennal base luteous 

 entirely covered with yellow tomentum ; back of the head blackish, 

 entirely obscured by greyish tomentum, flush with the eyes but 

 hollowed out behind, and with a very short inconspicuous blackish 

 posterior fringe ; vertex brownish black, somewhat obscured by yel- 

 lowish dust at the middle, conspicuously elevated, bearing rather sparse 

 long blackish pubescence. Proboscis thinner than in the female ; palpi 

 shorter and stouter, conspicuously shorter than half the length of the 

 proboscis, dilated about the middle, and elevated at right angles to the 

 proboscis ; the pubescence on both upper and outer surfaces much longer, 



