Chilosia. 183 



below the middle, broadest on hind tibiæ; middle tarsi more or 

 less yellowish on the basal joints; the hairs on femora black behind 

 front femora and on the apical part or half of posterior femora, for 

 the rest pale; on the tibiæ the hairs are chiefly black except the usual, 

 golden pubescence on front and hind tibiæ ; hind femora densely black- 

 setulose beneath ; hind metatarsi somewhat thickened. Wingrs some- 



Fig. 93, Wing of G. vernalis d". 



what brownish tinged; upper marginal cross-vein curved above, the 

 upper angle rectangular. Squamulæ whitish with a whitish fringe. 

 Halteros pale yellow. 



Female. Frons of medium breadth, a little widening downwards, 

 with the middle channel indistinct or quite wanting; the frons has 

 short, yellow hairs, in front of the ocelli are black hairs. Antennæ 

 with the third joint larger than in the male and often paler. Thorax 

 almost not more strongly pimctate than in the male, with short, some- 

 what depressed or more erect, yellow hairs, often more or less black 

 on the posterior part of the disc. Abdomen ovate, shining, with short, 

 depressed, black hairs, but longer, erect and yellow at the sides of 

 second and third segments, and sometimes the short hairs yellow over 

 a large part of the segments and also more erect. Legs chiefly as in 

 the male but the tarsi often paler and also front and hind tarsi pale 

 on the basal joints, especially below; hind femora black-setulose below. 



Length 5,5 — 7 mm. 



The pupa is yellowish white, of the same characteristic shape as 

 that of albitarsis, as the posterior end is cut off, forming a flat disc 

 bearing in the middle the yellow spiracular process stretching hori- 

 zontally backwards. The length is about 4 mm. 



This species varies somewhat; the eye-hairs may vary in length, 

 but are always rather short; the antennæ vary in colour from red to 

 almost black, and the third joint may also vary a little in size in 

 both sexes; fmally the hairs on thorax and abdomen vary not little 

 in colour, from nearlv all vellow to all black on thorax and ex- 



