132 Tachinidae. 



apical margin. Genitalia placed a little inwards below apex. Legs 

 somewhat strong with tibiæ robust and tarsi somewhat flattened. 

 Femora with long hairs except above, and tibiæ with a little stronger 

 long hairs. Wings with first posterior cell open, ending well before 

 apex of wing; discai angle rectangular, with a veinlet; ciibital vein 

 with bristles at base. Wing-membrane corrugate. 



The species is viviparous. The larva is cylindrical, somewhat 

 spindle-shaped, covered with spinules which are largest on dorsal 

 side. There are two mouth hooks and the antennal papillæ lie close 

 to each other, each with two small chitinous rings on apical end. 

 The species live as larvæ parasitic on species of Cervus and on Rangifer 

 and Alces. The female injects the larvæ in the nostrils of the host 

 and the larvæ live here and in the gullet. When fullgrown they quit 

 the host through mouth or nostrils and pupate in the ground, and 

 the fly emerges after a month or thereabout. The female deposits 

 in summer, and the larvæ hibernate in the host. 



Of the genus four European species are known, one occurs in 

 Denmark. 



1. C. stimulator Clark. 



1815. Clark, Essay on the Bots, 69, Tab. V, Fig. 28, 29 {Oestrus). — 

 1824. Meig. Syst. Beschr. IV, 170, 4 (Oestrus). — 1862. Schin. F. A. I, 395. — 

 1863. Brauer,' Mon. Oestr. 206, 4, Tab. III, Fig. 10, Tab. IX, Fig. 8. — 1907. 

 Kat. palåarkt. Dipt. III, 556. 



Male. Frons fuUy as broad as the eye. Orbits broad, blackish, 

 at the front end silvery pruinose, cheeks blackish, silvery above 

 and at eye-margin; jowls grey. Orbits and cheeks with erect yellow 

 hairs, along the eye-margin black hairs; face and jowls with pale 

 yellow or yellow hairs. Occiput grey with yellow hairs and black 

 hairs along the eye-margin. Antennæ brown, third joint generally 

 black; arista thickened at base. Thorax black, shining, a little brownish 

 before the suture; it is clothed with dense erect yellow pile, behind 

 the suture a transverse band with black hairs, behind which again 

 some yellow hairs; behind the suture five narrow, more shining, 

 bare stripes are seen, but they are generally slightly marked, and 

 not seen in front of the suture. Scutellum with yellow hairs. Abdomen 

 black, shining, with dense yellow or more reddish erect pile; a narrow, 

 bare middle line is seen; on each side at the base there is a spot of 

 red or reddish hairs going over second, third and partly fourth seg- 

 ment, and the spot has black hairs in the middle; sometimes the 



