Chilosia. 187 



below the eye; the hairs iJvhitish below, very short upvvards but here 

 besides with long, black hairs. Antennæ not small, black, third joint 

 a little longer than broad ; arista short-pubescent. Thorax dark æneous, 

 seen quite from in front slightly pruinose with very faint traces of 



Fig. 96. Antenna of C. mutabilis ^, from the inside, x 75. 



stripes; it is fmely punctate, shining; it is clothed with long, erect 

 hairs, and with shorter hairs, especially distinct on the posterior part 

 and scutellum where the long hairs are longest ; the hairs may be all 

 greyish or brownish yellow with only a few black intermingled, or 

 the long hairs are all black. There are distinct notopleural, incon- 

 spicuous supraalar and more distinct postalar bristles; scutellar marginal 

 bristles numerous, distinct and long. Pleura with longish, black and 

 pale mixed hairs. Abdomen narrow and somewhat long, parallel- 

 sided; it is dull black on second and third segments, only a little 

 shining at the front corners of the latter; fourth segment æneous 

 black, shining; abdomen is clothed with somewhat long, erect, yellow 

 hairs, on the middle of third and fourth segments are short, black, 

 more depressed hairs, extended over the whole breadth backwards on 

 the fourth segment, and the hind corners or the whole side margin 

 of the segment often black-haired; also the second segment has often 

 the sides more or less black-haired, especially at the front corners. 

 Venter black, shining, with longish, pale hairs, the fourth segment has 

 short, black hairs, long at the hind margin. Legs black, anterior 

 femora narrowly yellowish at the apex; anterior tibiæ reddish at the 

 base and narrowly at the apex, hind tibiæ slightly or not; anterior 

 tarsi with the three middle joints, reddish, metatarsus black, at all 

 events above; the hairs behind front femora black and also generally 

 a few below middle femora, for the rest pale; the hairs on tibiæ dark, 

 except the usual golden pubescence on front and hind tibiæ; hind 

 femora distinctly black-setulose below; hind metatarsi a little thickened. 

 Wings somewhat slightly greyish brown tinged; upper marginal cross- 

 vein a little curved above, the upper angle a little acute or almost 



