550 Tachinidae. 



1. M. rufiventris Fall. 



1816. Fall. Vet. Acad. Handl. 244, 16 (Musca) et 1820. Dipt. Suec. Muse. 

 41, 8 {Tachina). — 1849. Zett. Dipt. Scand. VIII, 3264, 14—15 [Dexia). — 

 1907. Kat. palåarkt. Dipt. III, 433. — 1924. Stein, Arch. f. Naturgesch. 90, 6, 

 150, 2. — Musca compressa Schell. (nec Fabr.) 1803. Genr. Mouch. Dipt. 62. 

 — 1826. Meig. Syst. Beschr. V, 41, 13 {Dexia) et 1838. VII, 253, 1, Tab. LXXII, 

 Fig. 1— 5 {Wiedemminia). — 1838. Zett. Ins. Lapp. 652, 1 {M^isca) et 1844.. 

 Dipt. Scand. III, 1277, 14 (Dexia). — 1889. B. B. Denkschr. Akad. Wiss. 

 Wien, LVI, 137, Tab. X, Fig. 268. — M. praeceps Scliin. (nec Scop.) F. A. I, 

 556. — 1896. Pand. Rev. Entom. XV, 147, 1. 



Of this species I have only seen the female. Frons above nearly 

 as broad as the eye. Head bluish silvery, orbits in some views black, 

 shming; jowls partly red; frontal stripe velvet black or brownish 

 black. Orbits with very few, small hairs; jowls black-haired behind. 

 Occipiit black above, grey below, with white hairs and above only 

 some few black hairs. Antennæ with the basal joints red, third joint 

 brownish black; arista thickened at base, short-hairy. Palpi ycllow. 

 Thorax black, blnish grey pruinose, with two broad black stripes, 

 continued on sciitellum ; it is sparingly black-haired. Abdomen black, 

 shining, with large red side spots over second, third and foiirth seg- 

 ment; there are silvery pruinose front bands on third and fourth 

 segment, especially visible on the sides down to the ventral middle 

 line, and here forming spots; the middle dorsum of the two segments 

 somewhat bluish grey pruinose. Abdomen black-haired; second 

 segment with a pair of marginal bristles, third, fourth and fifth with 

 a pair of discai and a row of m.arginal. Legs long, with long tarsi; 

 coxæ grey pruinose, fem.ora yellow, tibiæ reddish black to black 

 and tarsi black. Wings yellowish brown or brown tmged; veins 

 brown. Squamulæ whitish. Halteres brownish yellow. 



Length. About 9 mm. 



This beautiful species seems very rare in Denmark, I know 

 only four specimens, all females; Copenhagen (the author), Gentofte, 

 Grib Skov (Kryger) and at Vemmetofte (Stamm); the dates are in 

 the first part of August. It is recorded often to occur on windows and 

 one of my specimens is also taken indoors. 



Geographical distribution: — Europe; towards the north to 

 middle Sweden, and in Finland. 



Remarks: In Kat. palåarkt. Dipt. compressa in Pandellé is given 

 as synonym to the present species, but according to the description 

 it must be his praeceps which belongs here. 



