Chilosia. 175 



notopleural, supraalar and postalar bristles, the supraalar shortest, the 

 postalar rather long; scutellum with numerous, sornewhat long, distinct 

 marginal bristles. Pleura bluish black, with longish, black hairs. Ab- 

 domen sornewhat short and ovate, æneous black, shining, second seg- 

 ment duU velvet black except the shining hind margin, and third 



Fig. 88. Antenna of C. impressa cf, from the inside. X 75. 



segment duU on the front part in the middle; abdomen is clothed 

 with long, erect hairs, shorter on the middle; they are yellow, only 

 black at the hind margins of second, third and fourth segments and 

 especially at the hind corners of these segments. Venter black, shining, 

 slightly pruinose, with paler hind margins to the segments; it has 

 long, pale hairs on the two first segments and at the sides and hind 

 margins of third and fourth but the middle part of these latter seg- 

 ments has short, black hairs. Genitalia somewhat small, with black 

 hairs. Legs all black; the long hairs black behind front femora, but 

 mostly pale on posterior femora except at apex, and the short hairs 

 on the anterior side of anterior femora and the posterior side of hind 

 femora chiefly pale; below the front side of hind femora some long, 

 downwards directed hairs; the hairs on tibiæ dark except the usual, 

 golden pubescence below front and hind tibiæ; the tibiæ are short- 

 fringed above, hind tibiæ a little longer fringed, especially about the 

 middle; hind femora densely black-setulose beneath but the bristles 

 short ; hind metatarsi slightly thickened. Wings somewhat yellow or 

 brownish yellow tinged, especially on the basal part, and the base 

 itself distinctly yellow; upper marginal cross-vein curved above, the 

 upper angle about rectangular. Squamulæ yellowish with a darker 

 yellow margin and fringe. Halteres yellow. 



Female. Eyes with very short hairs. Frons of medium breadth, 

 a little widening downwards, without middle channel; it has short, 

 mixed black and yellow hairs, at the vertex black hairs. Antennæ 

 with the third joint somewhat larger than in the male, and paler. 

 Thorax with short, depressed, greyish hairs, more or less mixed with 



