Ghilosia. 169 



whitish. Antennæ not large, third joint orange, almost circular; arista 

 apparently bare, it may be indistinctly brownish at the base. Thorax 

 æneous or greenish black, finely punctate, shining; it is clothed with 

 somewhat long, yellow hairs; there are weak and inconspicuous noto- 

 pleural, short supraalar and a little longer postalar bristles ; scutellum 

 has rather fine and little conspicuous marginal bristles, which are 

 moreover sometimes yellow. PJeura with long, yellow hairs. Abdomen 

 narrow and a little more parallel-sided than in fraterna, æneous and 

 shining; the second segment almost quite dull, the third indetinitely 

 dullish on the hind part and sometimes also in the middle line; ab- 

 domen is clothed with somewhat long, erect, yellow hairs, a little 

 shorter on the middle. Venter shining, with long, pale hairs. Genitalia 

 somewhat pruinose. Legs with femora black with yellow apex, tibiæ 

 yellow with a blackish ring below the middle, the ring may be brown 

 or indistinct on hind tibiæ; tarsi yellow with the last two joints black 

 and hind metatarsi black above. The hairs on femora a little longer 

 than in fraterna, all pale, or black behind front femora and at the 

 apex of posterior femora; the hairs on tibiæ almost all pale, only 

 above the middle tibiæ are dark hairs; hind femora black setulose 

 below; hind metatarsi almost not thickened. Wings a little yellowish 

 tinged; upper angle at the upper marginal cross-vein a little acute. 

 Squamulæ whitish with yellow margin and fringe. Halteres yellow. 



Female. Frons not narrow, slightly widening downwards, trisul- 

 cate, the middle channel more or less indistinct; it is yellow-haired, 

 on the vertex black hairs. Third antennal joint somewhat large, con- 

 siderably larger than in the male, about circular. Thorax less coarsely 

 punctate than in fraterna^ the hairs short, but longer than in fraterna 

 and more erect; they are all yellow or black on the middle of the 

 disc; scutellar marginal bristles more conspicuous than in the male 

 and stronger, but varying in length, and sometimes more or fewer 

 are yellow, but they are longer than in fraterna. Abdomen with 

 longish, yellow, depressed hairs, erect at the basal corners of the seg- 

 ments. Legs with the rings on tibiæ less distinct than in the male; 

 tarsi with generally only the last joint black, and hind metatarsi less 

 darkened; hind femora black setulose below on the apical half. 



Length 9 — 9,6 mm. 



This species is much like fraterna, but is dlstinguished in both 

 sexes by the longer hairs on eyes, thorax and abdomen, and in the 

 female the hairs on thorax are more erect; the scutellar bristles are 

 longer, abdomen is narrow and less ovate, the antennæ brighter orange 

 and in the female considerably larger, the rings on tibiæ are generally 

 more distinct, and the tarsi are paler; fmally in the female the frons 



