158 



Tachinidae. 



4. O. gentilis (R. D. ?) Meig. 



1838. Meig. Syst. Besclir. VII, 302, 9 {Musca). — 1924. Stein, Arch. f. 

 Naturgesch. 90, 6, 266, 4. — O. germanorum 1911. Kram. (nec Villen.) Abhandl. 

 Nat. Gesell. Gorlitz, 27, 44, Tab. III, Fig. 15. — O. Villeneuvi Kram. 1917. 

 1. c. 28, 28, 294. 



Male. Frons narrow above, orbits touching or nearly; the frons 

 very slightly protruding and cheeks somewhat narrow. Orbits and 

 cheeks silvery, shifting to dark, jowls grey; frontal stripe black. 

 Orbits and cheeks with fine liairs, the latter only on upper half; 

 jowls black-haired. Occiput bluish, greyish pruinose with all black 

 hairs. Antennæ black, third joint about twice as long as second; 

 arista not densely but long-plumose in basal two thirds or more. 



Palpi yellowish to blackish. Thorax blue, 

 somewhat shining, slightly bluish grey 

 pruinose, with three broad slightly marked 

 stripes; it is black-haired; three post- 

 sutural and one præsutural intraalar 

 bristle. Abdomen bluish, shining, slightly 

 whitish pruinose on front part of third 

 and fourth segment; a dark middle line 

 indicated. Abdomen is black-haired; third 

 segment with bristly hairs at hind mar- 

 gin, generally a stronger pair on the 

 middle, fourth segment with a marginal 

 row of bristles and fifth with fine bristles 

 all over. Genitalia small; upper forceps 

 broad seen from behind, somewhat abruptly tapering to a small 

 apex and only cleft at the apex which is ventrally curved; arms of 

 lower forceps somewhat broad, blade-shaped, somewhat triangularly 

 attenuated and a little obtuse at apex. Legs black; claws and pulvilli 

 only a little elongated. Wings hyaline or a little brownish towards 

 base and anterior margin; apical cross-vein straight or nearly. Squa- 

 mulæ whitish or yellowish, not hairy. Halteres brownish or brownish 

 yellow. 



Female. Similar; frons about of the breadth of the eye. 

 Length 5 to nearly 7 mm. 



O. gentilis is not rare in Denmark; Ordrup Mose, Ermelund, 

 Dyrehaven, Fure Sø, Birkerød and in Jutland at Madeskov; the dates 

 are ^^4 — ^U- ^ have taken specimens on 2^/4 by digging in sandy slopes 

 where they were hidden under the sand, but no puparia were seen. 



Fig. 34. O. gentilis, forceps in 

 profile. 



