Chilosia. 167 



punctate; it is clothed with relatively short, erect hairs which are 

 yellow, but at the sides more or less mixed with black hairs, and on 

 the posterior part and scutellum quite or almost quite black, but just 

 in front of scutellum are again yellow hairs. 

 There are very short supraalar and more con- 

 spicuous postalar bristles, and at the margin 

 of scutellum (generally) short and fine bristles. 

 Pleura with longish, yellow hairs, at the upper 

 hinder angle of mesopleura a tuft of black 

 hairs, among which a couple of bristles or 

 bristly hairs. Abdomen rather broad and 

 ovate, æneous black, shining but somewhat 

 dull on second and third segments; it is clothed 

 with not long, yellow or reddish yellow, erect 

 hairs, short on the middle. Venter black, 

 shining, with long, yellow hairs. Legs with 'c. fratema d'^ 



the femora black with yellow apex, tibiæ yel- 

 low, the anterior with a small, black or blackish ring just below the 

 middle, most obvious on the posterior side; hind tibiæ with a similar 

 but more faint ring or patch, or this almost disappearing; middle 

 tarsi with the two basal joints reddish, front and hind tarsi with the 

 basal joints reddish below but darkened above, especially on hind 

 tarsi. Femora not long-haired, the hairs black behind front femora 

 and on the apical half on the front side of hind femora, for the rest 

 yellow; the hairs on tibiæ partly yellow, partly black; hind femora 

 densely black-setulose beneath, yellow at the base; hind metatarsi 

 very slightly thickened. Wings yellow or brownish yellow at the base 

 and on the anterior part; upper marginal cross-vein curved above, 

 the upper angle rectangular. Squamulæ white with margin and fringe 

 pale yellow. Balteres yellow. 



Female. Eyes with very short, pale hairs, as in the male wanting 

 on the lower end of the eye. Frons somewhat narrow, widening 

 downwards, with a faint or no middle channel; it has short, yellow 

 hairs, at the vertex some black hairs. Antennæ with the third joint 

 a little larger than in the male. Thorax with short, depressed, yellow 

 or almost golden hairs; short, black bristles at the margin of scutellum 

 generally present, but they may sometimes be very weak and yellow 

 and then very little conspicuous. Abdomen very ovate, shining, with 

 short, depressed, yellow hairs, only erect at the basal corners of the 

 segments. Legs with the rings on tibiæ generally more faint than in 

 the male and hind tibiæ generally quite yellow; all tarsi sometimes 

 yellow with only the last two joints black; hind femora not setulose 



