466 Tachinidae. 



hairs. Occiput greyish, with black hairs and pale hairs below. Antennæ 

 yellow, third joint broad and dilated, scarcely thrice as long as second; 

 arista yellow, thickened in basal two thirds, second joint a little 

 elongated. Palpi yellow. Thorax grey, without stripes; scutellum 

 yellowish, a little greyisb pruinose. Four postsutural dorsocentrals. 

 Abdomen yellow, sometimes with a narrow, dark middle stripe; the 

 three last segments with a quite narrow, whitish pruinose front 

 band, and abdomen in certain views a little whitish pruinose, except 

 the middle line. Abdomen black-haired, with the usual bristles. 

 Legs yellow, tarsi black or blackish. Wings very slightly tinged; 

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

 posterior crosg-vein about midway between medial cross-vein and 

 angle; anal vein not reaching margin; only cubital vein with bristles, 

 stretching long beyond medial cross-vein. Squamulæ yellowish. Hal- 

 teres yellow. 



Female. Similar; antennæ with third joint as long as in the 

 male, but less broad; front tarsi a little dilated outwards, with fifth 

 joint considerably longer than fourth. 



Length 5 to nearly 6 mm. 



A. bicolor is rare in Denmark, I know 9 specimens, all bred from 

 Eriogaster lanestris, taken at Køge (Weis). The species is besides 

 known from Lasiocampa quercus, Tephroclystia denotata and Scardia 

 boleti. 



Geographical distribution: — Europe; towards the north re- 

 corded from Finland. 



Remarks: I think that bicolor Meig. and bicolor Zett. are the 

 same species; I have seen Zetterstedt's specimen from Sahlberg, it is 

 a male, not as Zetterstedt means a female; it shows a dark middle 

 stripe on abdomen, but the same is the case with some of our spec- 

 imens, while others have a quite yellow abdomen, and they are all 

 bred from the same Lepidoptere. 



9. A. anomala Zett. 

 1849. Zett. Dipt. Scand. VIII, 3213, 2 et 3231 obs. 2 {Siphona). — 1894. 

 Pand. Rev. Entom. XIII, 112, 9 (Thryptocera). — 1907. Kat. palåarkt. Dipt. 

 III, 386. — 1924. Stein, Året. f. Naturgesch. 90, 6, 130, 1. 



Male. Frons broad, towards twice as broad as the eye; jowls 

 not one third of the height of the eye. Orbits yellowish, cheeks and 

 jowls more whitish; frontal stripe reddish yellow; the usual bristles 

 present. Occiput grey, yellow below, above with black hairs behind 



