276 Tachinidae. 



wing; discai angle obtuse, with an indication of a veinlet; a costal 

 spine present. 



Of the genus three palæarctic species are recorded, one occurring 

 in Denmark. 



1. D. grisescens Fall. 



1816. Fall. Vet. Acad. Handl. 243 et 1822. Dipt. Suec. Muse. 44, 16 

 (Musca). — 1826. Meig. Syst. Beschr. V, 45, 21 et 1830. VI, 374 (Dexia). — 

 1844. Zett. Dipt. Scand. III, 1278, 15 et 1859. XIII, 6176, 15 (Dexia). — 1862. 

 Schin. F. A. I, 557. — 1889. B. B. Denkschr. Akad. Wiss. Wien, LVI, 126, 

 Tab. VIII, Fig. 203. — 1896. Pand. Rev. Entoni. XV, 162, 12 (Dexia). — 1900. 

 Stein, Ent. Nachricht. XXVI, 139. — 1907. Kat. palåarkt. Dipt. III, 449. - 

 1921. Baer, Zeitschr. f. angew. Ent. VII, 380. — 1924. Stein, Arcli. f. Natur- 

 gesch. 90, 6, 239. — D. cristata Schin. (nec Meig.) 1862. F. A. I, 557. 



Male. Frons narrow above, scarcely half as broad as the eye, 

 widening downwards. Head silvery greyish pruinose, jowls partly 

 reddish in certain views; frontal stripe brownish red. Occiput grey, 

 with black hairs and pale hairs inwards below. Orbits bare; cheeks 

 with some few black hairs, and jowls black-haired below. Antennæ 

 black with basal joints reddish, third joint at most twice as long as 

 second; arista thickened at base. Palpi yellowish. Thorax greyish 

 pruinose, palest at humeri, with four dark stripes, the median narrow, 

 abbreviated just behind the suture, the lateral broadly interrupted 

 at the suture. Thorax with black hairs; one posthumeral and two 

 intraalar bristles. Apical scutellar bristles somewhat small, crossing. 

 Abdomen all grey pruinose, with black hairs, and with only marginal 

 bristles, none on second segment, a pair on third and a row on fourth 

 and fifth. Fifth sternite cleft to base. Legs with femora obscurely 

 reddish, grey pruinose, or blackish, tibiæ brownish or yellowish red, 

 tarsi black or blackish. Wings a little brownish tinged; veins brown. 

 Squamulæ whitish. Halteres yellow. 



Female. Similar; frons broad, about twice as broad as the eye. 



Length 6 — 8 mm. 



D. grisescens is not rare in Denmark; Hellerup, Ordrup Mose, 

 Charlottenlund, Lundtofte, Ermelund, Dyrehaven, Lyngby, Nyrup 

 Hegn and in Jutland at Hov near Odder; the dates are ^^|^ — 'Vs- It 

 occurs on various flowers, especially umbellifers. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden, and in Finland. 



