Chilosia. 165 



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

 yellow or pale yellow hairs of medium length; on the hind part there 

 are besides short, black hairs on the middle, generally not very con- 

 spicuous. There are no bristles, only gener- 

 ally a couple of stronger, black hairs on the 

 postalar calli. Pleura with long. yellow 

 hairs and above with some black hairs. 

 Abdomen dark æneous or greenish, shining, 

 second and third segments duU on the disc, 

 the dull space contracted in the middle and 

 thus more or less hour-glass-shaped, especi- 

 ally on third segment. Venter black, shining, 

 with long, pale hairs. Legs with the femora 

 black with yellow apex, tibiæ yellow with 

 a somewhat broad, black ring below the 

 middle; anterior tarsi yellow, the two or pig. 82. Head of C. cMom c?. 

 three last joints black, hind tarsi black 



above, but the three basal joints yellowish below; the basal joints of 

 front tarsi also more or less darkened above. The long hairs on the 

 femora black behind front femora, yellow on posterior femora, but 

 black below middle femora and at the apex of hind femora ; the hairs 

 on tibiæ partly yellow, partly dark; hind femora black setulose beneath; 

 hind metatarsi almost not thickened. Wings yellow tinged, especially 

 at the base and anterior part; upper marginal cross- vein curved above, 

 the upper angle rectangular. Squamulæ whitish with yellow margin 

 and tringe. Halteres yellow, the knob more or less darkened. 



Female. Frons somewhat broad, widening downwards, only with 

 lateral channels; it is yellow-haired with short hairs. Epistoma more 

 hoUowed than in the male, Third antennal joint slightly larger. Thorax 

 with short, depressed, almost golden pubescence. Abdomen shining, 

 with depressed hairs, coloured as on thorax, only erect at the basal 

 corners of the segments thus giving rise to a slight indication of bands. 

 Legs paler than in the male, the rings on tibiæ smaller and often 

 more faint; tarsi quite yellow except the two last joints, and some- 

 times front and hind metatarsi blackened above. The legs all yellow- 

 haired ; hind femora finely setulose beneath, the bristles yellow, only 

 some black towards apex. 



Length 9 — 10,5 mm. 



One of our specimens has been bred ; the pupa is yellow, coni- 

 cally tapering behind but somewhat rounded; it has somewhat short, 

 yellow, rugose anterior spiracular tubes, and an upwards directed, 

 about one mm long, yellow posterior spiracular process, rugose in 



