498 Syrphidae. 



long. Antennæ brown or pale brown, third joint almost twice as 

 high as long; arista inserted just at the upper corner, at some distance 

 from tlie base. Thorax blackish, shining, somewhat yellowish pruinose 

 behind; it is clothed with long, somewhat dense, yellow pile. Scutel- 

 lum yellowish pruinose, with similar hairs as on thorax. Pleura with 

 long, pale yellow hairs. Abdomen elongate, scarcely as broad as 

 thorax, a little narre wing backwards; it is black and shining; first 

 segment grey except the extreme hind margin, second segment yel- 

 lowish grey pruinose on the front half of the sides and with a similar, 

 narrow, transverse band, lying before the middle and narrowly inter- 

 rupted in the middle; third segment with a similar but still narrower 

 band, a little more broadly interrupted in the middle, and fourth seg- 

 ment likewise but the band lying at the front margin and generally 

 less distinct; abdomen is clothed with somewhat long but not dense, 

 whitish or pale yellow hairs, most conspicuous at the hind margins 

 of the segments; at the hind margin of the fourth segment the hairs 

 are brown, and the genitaha have brownish black hairs; at the basal 

 corners of second segment the hairs are long. Venter black, somewhat 

 shining, the first segment grey pruinose; the hairs are long and pale, 

 the fourth segment has shorter, darker to black hairs on the hind 

 part. Legs with the femora black with yellow apex, tibiæ yellow, 

 hind tibiæ more or less dark on the apical part; also the front tibiæ 

 may be somewhat darkened on both sides, and sometimes middle 

 tibiæ similarly ; tarsi yellowish with the last two, or on front tarsi 

 three joints darkened; legs with the hairs on femora rather long; all 

 the hairs yellow, only below the apex of middle femora some black, 

 bristly hairs, and the hind femora densely black- spinulose below. 

 Wings a little yellowish with similar dark clouds as in the other 

 species, the middle one rather distinct and the subapical stretching 

 distinctly down the cross-vein. Squamulæ with their fringes and the 

 balteres yellow. 



Female. Vertex and frons moderately broad, widening down- 

 wards, all black, with only a pair of dust spots; the hairs short, 

 black. sometimes paler, the space above the antennæ bare; epistoma 

 with a very broad, black, shining middle stripe so that it is pruinose 

 only along the eyes and from here down towards the lateral angles 

 of the oral margin. Thorax more pruinose than in the male. Ab- 

 domen quite as in the male, the narrow band on fourth segment 

 more distinct and less near the front margin. 



Length about 12—13 mm. 



C. asilica is rare in Denmark, I know only four specimens ; Greis- 

 dal at Vejle (Schlick) and at Silkeborg (Axel Petersen). My dates are 



