286 Tachinidae. 



or five) ; a pair of quite minute, parallel apical hairs present or wanting; 

 a pair of discai bristles. Abdomen all grey or yellowish grey pruinose, 

 sometimes \sdth indication of a middle stripe on basal part; it is 

 black-haired, with a pair of marginal bristles on second and third 

 segment and a row on fourth; on second segment the bristles may 

 be wanting. Legs black. Wings very slightly tinged or nearly clear; 

 veins brown; first posterior cell very narrowly open or just closed 

 quite near apex of wing. Squamulæ a little yellowish. Halteres 

 brownisli yellow. 



Female. Similar; frons broader, as broad as the eye. Scutellum 

 as a rule with three marginal bristles on each side. 



Length 5,5 to nearly 9 mm. 



I have examined Zetterstedt's type to T. usta. 



V. cinerea is common in Denmark; Lersø, Charlottenlund (Stæ- 

 ger), Dyrehaven, Lyngby, Ryget Skov (Kryger), at Skelskør (H. J. 

 Hansen); on Lolland at Nysted (the author), and in Jutland at Hov 

 (the author) and Harboøre (Engelhart); the dates are ^^/g — ^V?- 

 It occurs on umbellifers and in low herbage. It is known as parasitic 

 on Procrustes coriaceus, Carahus violaceus, hortensis, glabratus, cla- 

 thratus and cancellatus, Zabrus tenehrioides and the non Danish 

 C. gemmatus. Nielsen has (Entom. Medd. 2, IV, 1909, 72) treated its 

 biology; he bred it from P. coriaceus and C. violaceus and hortensis; 

 the imagines developed at the middle of June; in his collection are 

 further specimens bred from Calathus fulvipes. In 1918 (Vidensk. 

 Medd. fra Dansk Naturh. Foren. 69, 253) Nielsen further enumerates 

 as hosts Amara aulica, Broscus cephalotes, Calathus erratus and 

 fuscipes, Ophonus ruficornis and rubripes and Pterostichus niger. In 

 the large hosts a number of up to ten parasites may develop, but 

 in the small only one. 



Geographical distribution: — Europe and in Transcaspia; 

 towards the north to middle Sweden, and in Finiand. 



59. Monocliaeta B. B. 



Somewhat small, greyish to brownish pruinose species. Frons 

 broad and equal in both sexes, somewhat strongly protruding, epi- 

 stoma retreating. Cheeks and jowls broad, the latter about half 

 the height of the eye. Ocellar and in male only inner, in female both 

 pairs of vertical bristles present; in both sexes one orbital bristle. 



