294 Tachinidae. 



intermediate triangle red; jowls grey; frontal stripe velvet black 

 or a little brownish. Frontal bristles descending to about insertion of 

 arista, two uppermost reclinate. Vibrissæ ascending to near middle, 

 except the large one on angle nearly all small. Orbits with a row of 

 black bristly hairs outwards to the frontal bristles, along the eye- 

 margin; jowls with black hairs. Occiput grey, with pale hairs, sparse 

 above, and with black bristles behind postocular bristles. Antennæ 

 black; third joint about four times as long as second; arista short, 

 as long as third joint, thickened in nearly basal two thirds, second 

 joint a little elongated. Palpi somewhat dilated outwards, black, 

 brownish at apex. Thorax black, a little shining, greyish pruinose, 

 with four black, not narrow stripes, the median abbreviated behind. 

 Scutellum black, greyish pruinose. Thorax black-haired; scutellum 

 with four marginal bristles on each side (as a rule), the apical crossing, 

 a little erect. Four sternopleural bristles. Abdomen black, shining, 

 with a white pruinose band on the front half of the three last seg- 

 ments, shifting with dark tessellations according to view; a black 

 middle line more or less visible. Abdomen is black-haired; second 

 segment with a pair of marginal bristles, third with a pair of discai 

 and marginal, and fourth with a pair of discai and a row of marginal 

 bristles; on the ventral side there is a patch of short dense hairs on 

 third and fourth segment. Genitalia small and hidden; upper forceps 

 cleft to base, about as long as the lower. Legs black; claws and pul- 

 villi not elongated. Wings a little tinged; veins brown; first posterior 

 cell open, ending in some distance from apex of wing; apical cross- 

 vein somewhat concave, angle about rectangular. Squamulæ whitish. 

 Halteres dark brown. 



Female. Similar; frons of about the same breadth or still broader; 

 outwards to the frontals no or small bristles. Palpi more dilated 

 outwards. 



Length 8 — 9 mm. 



C. senilis is rare in Denmark ; at Copenhagen, Amager (the 

 author), Dyrehaven, Ruderhegn (Kryger); in Jutland at Skeide 

 (Wtistnei), and on Bornholm at Rønne and Hasle (H. J. Hansen, 

 Weis); the dates are ^^/g — ^^/g; it was taken in copula on ^/g. Three spec- 

 imens from Bornholm are bred from Tapinostola elymi (Weis). The 

 species is otherwise recorded from Pyrausta nubilalis (Thompson, 

 Proc. Ent. Soc. Washington 25, 1923, .33). 



Geographical distribution: — Europe; not known north of 

 Denmark. It occurs perhaps in North America {myioidea R. D.). 



