Chilosia. 185 



and slightly descending; the lateral margin of the oral aperture is 

 short, the front margin deeply curved. Eye-margins somewhat nar- 

 row, a little pruinose, with longish, white hairs. Occiput grey pruinose, 

 the colour stopping below the eye; the hairs white below, yellow 

 above, and here besides long, black hairs. Antennæ small, the basal 

 joints black, the third roundish, brown or brownish red ; arista short- 

 pubescent. Thorax æneous or dark brassy, very finely punctate, 

 shining; it is clothed with medium long, ereet, yellow hairs; there are 

 black hairs in the præsutural depression but no distinct notopleural 

 or supraalar bristles and only one well developed postalar bristle; 

 scutellum with distinct but not strong marginal bristles. Pleura with 

 yellow hairs and some black hairs intermingled. Abdomen with 

 second and third segments duU black except the front corners of the 

 latter; the fourth segment æneous, shining; abdomen is clothed with 

 longish, erect, yellow hairs, on most of the duU parts are shorter, 

 black hairs. Venter grey pruinose, with long, pale hairs, on the middle 

 of third and fourth segments short, black hairs. Genitalia somewhat 

 pruinose. Legs with femora black with the extreme apex yellow, 

 only slightly on the hind femora; tibiæ yellow with a black ring 

 below the middle, broadest on hind tibiæ; tarsi black, the anterior 

 with the two basal joints more or less yellowish. Legs almost quite 

 pale-haired, only behind the front femora above the hairs more or 

 less black, and at the apex of posterior femora a few black hairs; 

 tibiæ with pale hairs, only hind tibiæ with black hairs on the front 

 side; hind femora setulose beneath, the bristles yellow, but black 

 on about the apical half; hind metatarsi almost not thickened. Wings 

 yellow or light brownish tinged towards the anterior margin; upper 

 marginal cross-vein curved above, the upper angle rectangular. Squa- 

 mulæ whitish with margin and fringe yellow or pale brownish. 

 Halteres pale yellow, the knob a little darkened. 



Female. Frons somewhat broad, a little widening downwards, 

 with a distinct dust spot on each side somewhat above the antennæ; 

 it is trisulcate but the middle channel indistinct; the pubescence short 

 and all whitish. Antennæ with the third joint somewhat larger than 

 in the male, but varying, and generally paler. Thorax densely punc- 

 tate, with short, obliquely erect, pale pubescence. Abdomen densely 

 punctate, shining, with short, depressed, black pubescence, and on 

 the fi'ont corners of the segments erect, pale pubescence; on the 

 horders between the black and the erect, pale hairs are depressed, 

 pale hairs forming arcuated fasciæ. Legs chiefly as in the male, but 

 all pale-haired; hind femora setulose below about as in the male. 



Length 7,5—8,6 ram. 



