isiA. 283 



comparatively bare, but the sides of the abdomen with pale yellow 

 hairs. Genitalia small, inconspicuous, conical, blackish. A'enter 

 blackish, posterior margins of seo;ments whitish grey. Lega 

 uuiforinly black, A'ery shortly pubescent; femora with some soft 

 hairs; hind tibiae with short bristles. Winr/s nearly clear; sub- 

 costal cell pale yellow ; venation normal ; halteres dark brown or 

 blackish, knobs hirge. 



2- Head: eyes se|)arated by a wide fmns equalling one-third 

 width of head ; upper half of frons, as also whole back of head, 

 greyish yellow, the latter with black hairs as in 6 ; upper half of 

 frons with a row of hairs near margin of eyes; vertical tnangle 

 distinct, dark , two narrow fuscous vertical lines from the vertical 

 triangle to an irregular transverse dark streak dividing the uppex' 

 from the lower half of the frons, the latter part being more ash- 

 grey and unmarked ; lower part'of the head greyish ; proboscis and 

 mouth larger than in c?,thus narrowing the cheeks considerably. 

 Thorax yellowish grey, with a median pair of narrow fuscous 

 lines, with a broader outer stripe, more or less divided into thi-ee 

 spots, the anterior one small and conical, the other two more 

 elongate; also an indistinct central line between the median pair 

 of narrow ones, and a small spot above the insertion of the wings; 

 sides of thorax cinereous grey ; scutellum yellowish grey, with 

 some yellow hairs as in d" . Abdomen black, bare ; ])Osterior 

 margin of segments rather broadly yellow ; sides with a little less 

 hair than in d" ; venter blackish ; ovipositor pale yellow, in- 

 conspicuous. Leifs and ivim/s as in c? . 



Length, 2^-34 mm. 



Described from several of both sexes taken by Dr. Annandale 

 at yimla, 16. v. 1909, where it was common on >Sedum rosidatum. 

 Cwhite stonecrop); the species was not seen anywhere except on 

 this plant. Phagu, 18-21. v. 1916 {Annandale). 



Types in the Indian Museum. 



226. Usia margiiiata, Bnm. 



Usia onair/inata, Brmietti, IJec. Ind. Mus. iii, p. 228 (1909). 

 S. Head with eyes contiguous for a shorter space than in 

 sedophila, black, bare ; upper facets larger than lower, and more 

 sharply defined from one another than in sedophUa ; frons ash- 

 grev, small, with a few black hairs ; vertex prominent, with some 

 black hairs, ocelli distinct : front margins of eyes and cheeks 

 with long black hair, which is considerably thicker on the under- 

 side, and which extends over the whole of the back of the head. 

 Anteiniae as in sedophila, but the third joint with a pale ring at 

 the base, giving the appearance of a minute basal joint, and the 

 tip bears on its upper side a jninute style-like process, just beyond 

 the siibapical depression ; 1st joint with some bristly black hairs, 

 2jkI with one or two minute hairs, 3rd bare. Thorax dull 

 black, almost velvetj^^ covered lightly on dorsum, and more thickly 



