120 Tachinidae. 



frontal stripe only a narrow furrow; vertical bristles short but strong; 

 orbits with dense, short, somewhat strong hairs, but no frontal 

 bristles; oral hairs quite short, dense, the angular vibrissa very short 

 but strong. Antennæ brownish and palpi yellowish. Abdomen with 

 fifth segment long, cylindrical, bent in under venter and ending 

 with some telescopically retractile segments and a claw-like ovi- 



Fig. 20. Wing of F. albipennis ?, 



positor. Wings dark brown, especially on apical two thirds and most 

 towards anterior margin; the colour sometimes seaming the veins. 

 Legs without bristles. 



Length 4 — 4,5 mm. 



F. albipennis is rather rare in Denmark; Gentofte, Lundtofte 

 (Kryger), Tisvilde (L C. Nielsen), at Ringsted (A. Petersen), and 

 in Jutland at Sønderborg (Wtistnei); only two specimens are caught, 

 in July and August, the others are bred from Ophonus ruflcornis 

 on 2^/4 — ^^/e (Kryger, A. Petersen). It occurs especially in sandy 

 localities. The species is known as parasitic on the Ophonus and 

 the non Danish Carahus Scheidleri. Nielsen has (Vidensk. Medd. fra 

 Dansk Nat. Foren. 67, 1916, 133) treated its biology; he got two 

 males bred from O. ruficornis, the Carab was found dead, there 

 were six pupæ in the host. Later on a female was bred, likewise from 

 O. ruficornis, and fmally from a specimen of the same host, containing 

 four pupæ, a male and a female has been bred, the former being 

 albipennis the latter denudata, thus proving that these are male and 

 female of the same species, as noted by Villeneuve 1. c. Nielsen 

 mentions, that the specimen he caught was running on a sandy road, 

 and was disinclined to flying. 



Geographical distribution: ■ — Northern and middle Europe 

 down into Austria (and if gagathea R. D. is the same still farther 

 towards south); towards the north to southern Sweden. 



