82 Tachinidae. 



hairs, not specially dense, erect on cheeks, decumbent on jowls. 

 Occiput pale yellow, a little greyish, just above dark, with whitish 

 hairs. Antennæ yellow at base, third joint brown or blackish; arista 

 dark. Thorax black, anteriorly more brownish, somewhat shining; 

 humeri and scutelliim yellow or brown; it is clothed with a dense 

 yellow or dark yellow pile, behind the suture a transverse band of 

 black pile. Abdomen black, shining, the hind margins to the segments 

 reddish; first and second segment with long, whitish yellow hairs, 

 the third and a larger or smaller part of fourth segment with short 

 black hairs, and apex with long red hairs. Arms of lower forceps 

 long and strong, brown. Legs yellow, femora more or less black above. 

 The legs are quite or mainly pale-haired. Claws and pulvilli long 

 and strong. Wings a little yellowish; veins pale yellow to brown; 

 posterior cross-vein considerably behind medial cross-vein. Squamulæ 

 yellowish white with a yellow margin and a long white fringe. Hal- 

 teres yellow. 



Female. Similar; frons only a little broader. Abdomen more 

 black-haired as this colour stretches farther both forwards and back- 

 wards; sixth segment elongate, cylindrical, seventh about as long 

 as broad, with two strong triangular lamellæ at end. Claws and 

 pulvilli slightly smaller than in male. 



Length 10 — 12 mm. 



G. haemorrhoidalis is common in Denmark and like equi the 

 imago is not rarely seen. 



Geographical distribution: — The species is known from all 

 Europe, North America and Australia (New Zealand). 



4, G. nasalis Linn. 



1758. Linn. Syst. Nat. X, 590 {Oestrus). — 1775. Fabr. Syst. Entom. 

 746, 3 {Oestrus). — 1824. Meig. Syst. Beschr. IV, 178, 5 {Gastrus). — 1844. 

 Zett. Dipt. Scand. 979, 4 {Gastrus). — 1862. Schin. F. A. I, 392. — 1863. Brauer, 

 Mon. Oestr. 86, 7, Tab. I Fig. 7, Tab. VII Fig. 6. — 1907. Kat. palåarkt. Dipt. 

 III, 596. — Oestrus veterinus Clark, 1797. Trans. Linn. Soc. III, 328, 4. — 1805. 

 Fabr. Syst. Antl. 230, 8. — 1818. Fall. Dipt. Suec. Haemat. 12, 6 — Gastrus 

 salutaris Meig. 1824. 1. c. III, 176, 3. ^ 1844. Zett. 1. c. III, 980, 5. — G. m- 

 gritus Zett. 1844. 1. c. 981, 6. 



Male. Frons narrower than the eye. Orbits, frons and face 

 dark yellow to dark brownish; cheeks greyish or blackish. Antennal 

 fovea and middle part of epistoma grey or dark. Orbits, frons and 

 face with reddish yellow hairs. Occiput black with the hairs yellow 



