Gastrophilus. 79 



The fullgrown larvæ. 



1. Only one girdle of spines on the segments 4. nasalis. 



— Two girdles of spines on the segments 2. 



2. The two last segments without spines above and on 



the next only a couple at each side 1 . pecorum. 



— Only last segment without spines above, the next with 



a couple at each side 3. 



3. The spines in second row of the girdles smaller than in 



first 2. equi. 



— The spines in the two rows less unequal in size .... 3. haemorrhoidalis. 



1. G. pecorum Fabr. 



1794. Fabr. Entom. Syst. IV, 230, 2 et 1805. Syst. Antl. 228, 2 (Oestrus). 



— 1818. Fall. Dipt. Suec. Haemat. 12, 5 (Oestrus). — 1824. Meig. Syst. Beschr. 

 IV, 176, 2 {Gastrus). — 1838. Zett. Ins. Lapp. 623, 2 et 1844. Dipt. Scand. III, 

 977, 2 {Gastrus). — 1862. Schin. F. A. I, 391. — 1863. Brauer, Mon. Oestr. 

 75, 3 Tab. I, Fig. 4, Tab. VII, Fig. 5, 7. — 1907. Kat. palåarkt. Dipt. III, 

 597. — Gastrus ferruginatus Zett. 1844. 1. c. III, 978, 3. 



Male. Frons about half as broad as the eye, widening down- 

 wards. Orbits and face yellowish brown; frontal stripe darker. Orbits 

 and frons with yellow hairs; cheeks and jowls with deeper yellow, 

 almost golden hairs. Occiput dark yellow with yellow hairs. Antennæ 

 yellow, arista darker. Thorax black, somewhat shining, sometimes 

 with brown stripes and more or less brown in front of scutelliim; it 

 has a dense, erect, yellow or dark yellow pile, behind the suture a 

 narrow transverse band of black pile. Pile on scutellum dark yellow 

 or brownish yellow, quite erect or directed a little forwards. Ab- 

 domen elongated ovate, brown, with yellow, more or less decumbent 

 pile. Genitalia small, lower forceps yellow to dark brown. Legs 

 yellow, femora black at base, this colour produced more or less 

 outwards below, and hind femora often black to near apex. Legs 

 yellow-haired, posterior femora generally more or less black-haired 

 on anterior side, especially at base. Wings more or less brownish 

 yellow tinged \\dth a slightly marked broad dark band behind medial 

 cross-vein down to postical vein and a similar spot at apex of first 

 posterior cell. Veins pale yellowish; no posterior cross-vein. Squa- 

 mulæ yellow, the lower with a long pale fringe, specially long at 

 the angle. Halteres brown. 



Female. Of a rather difTerent aspect. Frons broader than the 

 eye. Jowls more or less black and black-haired. Thorax often with 

 the black band only indicated. Abdomen long, with the two last 



