Metopia. 225 



brownish tinged; veins blackisli. Squamulæ yellowish, with a deep 

 yellow margin. Halteres dark yellow, with brownish pedimcle. 



Female. Similar; frons of the same breadth, but the eye-margins 

 more parallel and the facets not distinctly enlarged. Generally only 

 two marginal bristles on third abdominal segment. Front tarsi 

 simple. 



Length 5 — 8 mm. 



M. campestris is common in Denmark; Ordrup, Egebæks Vang, 

 Geel Skov, Ruderhegn, Hillerød, Grib Skov, Tisvilde, Boserup; on 

 Lolland at Nysted; on Funen at Odense and Veflinge, and in Jutland 

 at Sønderborg, Sandager, in Greisdal, at Skanderborg, Hou near 

 Odder, Laven, Frijsenborg and Rebbild; the dates are ^/g — ^^/g. One 

 of my specimens is bred from the nest of a Pompilus. 



Geographical distribution: — Europe; towards the north to 

 northern Scandinavia, in Lapland and Finland. 



2. M. leucocephala Rossi. 



1790. Rossi, Faun. Etr. II, 306, 1504 {Musca). — 1810. Fall. Vet. Acad. 

 Handl. XXXI, 270 {Musca) et 1820. Dipt. Suec. Muse. 8, 11 {Tachina). — 

 1824. Meig. Syst. Beschr. IV, 371, 229 {Tachina). — 1838. Zett. Ins. Lapp. 

 635, 5 et 1844. Dipt. Scand. III, 1026, 16 et 1849. VIII, 3228, 16 {Tachina). — 

 1862. Schin. F. A. I, 449. — 1889. B. B. Denkschr. Akad. Wiss. Wien, LVI, 

 114, Tab. VI, Fig. 137. — 1895. Pand. Rev. Entom. XIV, 307, 8. — 1907. 

 Kat. palåarkt. Dipt. III, 511. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 221, 2. 



— Tachina argyrocephala Meig. 1824. 1. c. IV, 372. 230 et 1838. VII, 248, 3, 

 Tab. LXXI, Fig. 26—30. — 1838. Zett. 1. c. 635, 6 et 1844. 1. c. III, 1028, 17. 



— 1862. Schin. F. A. I, 500. — 1900. Stein, Ent. Nachricht. XXVI, 132. — 

 Musca lahiata Fabr. 1787. Mantis. Ins. II, 346, 51 et 1794. Ent. Syst. IV, 329, 

 74 et 1805. Syst. Antl. 304, 100. 



Male. Frons above broader than the eye, very strongly conically 

 protruding, as long or fully as long as the eye is high; the eye-margins 

 are about parallel and the eye-facets not enlarged inwards. The frons 

 is of a peculiar formation; the orbits are broad and strongly dilated 

 forwards, their anterior halves meeting in the middle, the frontal 

 stripe thus triangular in the hinder half, but in the anterior half 

 only present as a narrow furrow. The orbits are greyish black behind, 

 but the dilated front halves are glistening silvery and form together 

 a rectangular plate. Cheeks silvery; jowls grey. P>ontal stripe black. 

 Ocellar bristles rather small. Frontal bristles interrupted as they 

 are not present on the silvery part or only a couple quite anteriorly, 

 then they are again present in front, stretching below the end of 



15 



