398 Tachinidae. 



116. — Tachina vertiginosa Fall. 1820. Dipt. Suec. Muse. 12, 21. — 1824. Meig. 

 Syst. Besclir. IV, 379, 242. — 1844. Zett. Dipt. Scand. III, 1050, 43 et 1859. 

 XIII, 6083, 43. — 1862. ScMn. F. A. I, 495 {Baumhaueria). — 1889. B. B. 

 Denkschr. Akad. Wiss. Wien, LVI, 107, Tab. V, Fig. 106 et 1893. LX, 193, 77 

 (Thelymorfha). 



Male. Frons above about double as broad as the eye, siightly 

 declining, rather protriiding; cheeks very broad; jovvls a little more 

 than half the height of the eye. Orbits and cheeks silvery, the former 

 somewhat greyish; jowls whitish grey; frontal stripe brownish red, 

 seen from in front silvery pruinose. Ocellar bristles not large. Orbits 

 with fine, jowls with stronger black hairs. Occiput bright grey, with 

 somewhat dense white hairs. Antennæ black, second joint reddish, 

 third long, linear, reaching lower margin of epistoma; arista about 

 as long as third joint, thickened to near apex. Palpi thin, yellow. 

 Thorax black, pale grey pruinose, with four black stripes, the median 

 diverging and abbreviated behind, the lateral interrupted at the 

 suture; scutellum yellowish red except base. Thorax black-haired. 

 Abdomen all grey pruinose, shifting according to view with dark 

 irregular tessellations on the hind part of the segments; abdomen 

 has rather strong, erect black hairs; on second segment a pair of 

 marginal bristles, on third a pair of discai and marginal and on 

 fourth a paii" of discai and a row of marginal bristles; fifth segment 

 almost quite covered with bristles; some of the hairs on the middle 

 of the segments may be rather bristly. Legs black. Wings quite 

 siightly greyish tinged; veins blackish brown; discai angle nearly 

 rectangular, apical cross-vein concave. Squamulæ white. Halteres 

 brownish. 



Female. Quite similar, only the head a little broader, eye- 

 margins parallel and antennæ a little shorter, not reaching lower 

 margin of epistoma. 



Length 8 — 9 mm. 



H. marmorata is not common in Denmark; on Sealand; on 

 Langeland at Lohals (the author); on Lolland at Bremersvold, and 

 in Jutland at Sønderborg (Wtistenei), in Nørholm Skov at Varde 

 (Kryger) and at Horsens (O. G. Jensen); the dates are Ve — ^U- It is 

 known as parasitic on Ly mantria dispar, Malacosoma neustria, Arctia 

 caja, Cucullia verbasci and the non Danish Arctia villica and quenselii, 

 and f urther on the Chrysomelid Phytodecta rufipes; some of our spec- 

 imens are bred from M. neustria. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden. 



