(jhilosia. 



161 



Fig. 80. Head of C. grossa c?. 



3166, 5 {Eristalis). — 1862. Schin. F. A. I, 286. — 1894. Beck. Nov. Aet. 

 Leop. Garol. Akad. LXII, 402, 58, Fig. 1. — 1901. Verr. Brit. Fl. VIII, 236, 

 14. — 1907. Kat. palåarkt. Dipt. III, 28. 



Male. Eyes with very long, blackish brown or black hairs. Frons 

 grey pruinose, especially towards the sides, with a longitudinal groove; 

 vertex and frons with long, yellow hairs. Epistoma densely yellowish 

 grey pruinose; it is slightly hoUowed below the antennæ, the central 

 knob not much protruding, lying rather 

 long downwards, the epistoma distinctly 

 hoUowed bet.ween it and the somewhat 

 prominent upper mouth edge, and some- 

 what descending. Eye-margins broad, yel- 

 lowish pruinose, with long, yellow hairs. 

 Occiput grey pruinose, this colour stopping 

 at the lower eye-margin; the hairs some- 

 what long and dense, yellow, palest below. 

 Antennæ not large, brown or blackish 

 brown, third joint roundish, slightly longer 

 than broad; arista thickoned in about the 

 basal third, almost bare. Thorax blackish 

 æneous, somewhat shining, finely punctate; 

 it is clothed with long, yellow^ or pale yellow hairs; there are no 

 bristles. Pleura grey pruinose, with long, pale hairs, above generally 

 some black hairs intermingled, and also a few black hairs in the præ- 

 sutural depression. Abdomen black, shining, sometimes with slight 

 bluish or cyaneous reflexes, second segment dull on the disc and third 

 more or less dullish; abdomen is clothed with long, erect, deeply yel- 

 low or reddish yellow hairs, paler at the base; they are also a little 

 paler at the apex and here with some black hairs intermingled and 

 the sides of fourth segment generally almost quite black-haired ; along 

 the middle the hairs are shorter. Venter black, greyish pruinose, with 

 long, pale hairs, but the fourth segment and the genitalia below with 

 black hairs. Legs with the femora black, a little greyish pruinose, 

 the very apex yellow; tibiæ yellow with a blackish ring below the 

 middle, hind tibiæ often quite yellow; tarsi black or blackish, the 

 middle tarsi may be slightly obscurely reddish on the middle. Femora 

 with rather long, mainly pale hairs, but partly black behind front 

 femora and at the apex of posterior femora; tibiæ longer-haired than 

 usual and hence a little fringed above, the hairs all pale; hind femora 

 not properly setulose beneath, but with somewhat short, strong hairs, 

 black in the apical half; hind metatarsi almost not thickened. Wings 

 somewhat yellowish tinged at the base and anterior margin; upper 



11 



