102 Tachinidae. 



Nielsen has (Vidensk. Medd. fra Dansk Nat. Foren. 67, 1916, 20) 

 treated its development ; the aiithor bred it from Elasmostethus 

 griseus; the host was taken on ^/^ with an egg of the parasite on 

 thorax, on ^"/a ^^e host was dead, the larva had bored out and pupated 

 outside the host, and the imago came on ^^s- Nielsen states, but 

 without further elucidations, that there are two yearly generations. 

 The statement is, however, confirmed by specimens of the Elas- 

 mostethus in his collection with eggs of the parasite, taken in September 

 at Tisvilde, and in his "Tachin-Studier" (ibid. 69, 1918, 260) he says 

 that the species hibernates as larva in second stage. 



Geographical distribution : — Europe down into France ; towards 

 the north to middle Sweden. 



2. G. pellucens Fall. 



1820. Fall. Dipt. Suec. Muse. 22, 45 {Tachina). — 1824. Meig. Syst. Beschr. 

 IV, 275, 64 {Tachina) et 1838, VII, 205, 1, Tab. LXIX, Fig. 14—19 {Clytia). 



— 1844. Zett. Dipt. Scand. III, 1084, 81 et 1859. XIII, 6092, 81 {Tachina). 



— 1862. Schin. F. A. I, 524 {Clytia). — 1889. B. B. Denkschr. Akad. Wiss. 

 Wien, LVI, 150 {Eliozeta). — 1894. Pand. Rev. Entom. XIII, 95, 7 {Phasia). 



— 1907. Kat. palåarkt. Dipt. III, 572. — 1924. Stein, Arch. f. Naturgesch. 

 90, 6, 257. — Tachina ftmiipennis Zett. 1859. 1. c. XIII, 6093, 81^82. 



Male. Frons a little narrower than the eye, slightly protruding. 

 Orbits broad, frontal stripe quite narrow; jowls rather narrow and 

 horizontal. Orbits and also vertex and upper part of clieeks golden 

 yellow, lower part of cheeks more whitish; jowls grey. The short 

 and narrow frontal stripe black. Frontal bristles fine. Orbits bare, 



Fig. 14. Wing of C. pellucens (^ . 



jowls with black hairs. Occiput yellowish grey with all white hairs. 

 Antennæ black, third joint about twice to nearly thrice as long as 

 second; arista thickened to near apex, bare. Palpi black or blackish. 

 Thorax brownish yellow pruinose with four narrow brown stripes, 

 the median abbreviated behind. Thorax black-haired; a posthumeral 



