542 Tachinidae. 



broader than thorax, a little convex behind and a little puffed out 

 below, considerably higher than long. Frons broad and equal or 

 about in both sexes, only slightly protruding. Jowls broad, from fully 

 half to two thirds of the height of the eye or more. In both sexes 

 ocellar, inner and outer, or in lentis only inner vertical bristles and 

 two or three orbital bristles. Postocellar and occipital bristles distinct. 

 Behind postocular bristles either rows of black hairs or only some 

 few. Frontal bristles few in number, only reaching to or just below 

 insertion of antennæ; above an outwards directed bristle in both 

 sexes. The bristles are produced down the cheeks to or about to the 

 lower end of the eye as a row of downwards directed genal bristles. 

 Cheeks for the rest bare or hairy. Jowls bare, with only hindmarginal 

 bristles, or {lentis) with some bristles. Vibrissæ not ascending, only 

 a single hair above the large vibrissa. Eyes bare. Epistoma a little 

 retreating, almost not reflected below. Proboscis short. Antennæ 

 inserted above middle of the eye, third joint twice to about thrice 

 as long as second; arista with second joint distinct, but not elongated. 

 Thorax rectangular; three postsutural dorsocentrals and two præ- 

 and two or three postsutural acrostichals; a præsutural intraalar 

 bristle present or wanting. Scutellum with two or three marginal 

 bristles on each side, the apical strong, crossing; besides a pair or 

 more of discai or præapical. Two or three sternopleural bristles. 

 Pteropleura with a little bunch of hairs above. Abdomen elongated 

 ovate, attenuated behind; excavation on second segment reaching 

 hind margin, except in costata; there are only marginal or both discai 

 and marginal bristles; second segment without bristles. Legs with 

 anterodorsal bristles on hind tibiæ somewhat strong and unequal; 

 claws and pulvilli in male not elongated; three or four last joints 

 on front tarsi in female a little or somewhat dilated. Wings often 

 somewhat dark on anterior part; first posterior cell closed and with 

 a shorter or longer peduncle, ending a little before apex of wing; 

 discai angle rectangular or more obtuse; apical cross-vein strongly 

 concave or about straight; cubital vein with bristles to medial cross- 

 vein or beyond; in some not Danish species also subcostal vein with 

 bristles; a well developed costal spine (in the Danish species). 



The species are known as parasites on Heterocera. They are espe- 

 cially found in sandy localities, the males are here seen to run about 

 on the ground and with the wings in a curious upturned position. 



Of the genus some twenty palæarctic species are recorded; three 

 have hitherto been found in Denmark. 



