Ghilosia. 



189 



sides, with a longitudinal groove; vertex yellovv-haired, generally with 



a few black hairs at the front angle, frons black-haired, Epistoma 



grey pruinose below the antennæ, for the rest shining; it is very 



slightly hoUowed below the antennæ and 



the central knob slightly prominent, some- 



what pointed and lying rather long down- 



wards; between the knob and the mouth 



edge the epistoma is only little hoUowed, 



the lower part slightly prominent and des- 



cending. Eye-margins of medium breadth, 



not pruinose, with short, pale hairs, Occiput 



grey pruinose, the colour stopping below 



the eye ; the hairs are whitish below, yellow 



and short above, and here besides long, 



black hairs, but on vertex yellow hairs. 



Antennæ somevt'hat small, (though a little 



varying), third joint longer than broad, 



blackish to brownish red; arista short, apparently bare. Thorax 



æneous black, very fmely punctate, shining; it is clothed with long, 



erect, yellow or yellowish white hairs ; there are one notopleural, two 



or more short supraalar and two or three postalar bristles ; the bristles 



Fig. 97. Head C. ruralis ^. 



Fig. 98. Antenna of C. rxiralis cj, from the inside. X 75. 



are distinct but weak; the scutellar marginal bristles likewise weak, 

 of various numbers, not rarely only the middle pair distinct. Pleura 

 with long, yellowish hairs. Abdomen narrow, parallel-sided, æneous 

 and shining; second and third segments dull black, but with the front 

 corners of the second and a large side space towards the front margin 

 of the third shining and with a slight greyish hue, so that they almost 

 look as spots; abdomen is clothed with longish, erect, pale yellow 

 hairs, short on the middle. Venter shining, with long, pale hairs. 

 shorter towards the end. Legs with the femora black with yellow 

 apex, tibiæ yellow with a black ring a little below the middle; tarsi 

 yellow with the last joint black, front metatarsus blackish above and 



