80 Tachinidae. 



segments elongated and rather tapering; it ends with an ovipositor 

 consisting of a somewhat globular seventh segment with a pair of 

 lameHæ at the end; abdomen is black and black-haired, only second 

 segment and sometimes the sides of third yellow-haired. Femora 

 black except apex, and black-haired. 



Length. Male 12 — 13 mm, female 15 — 16 mm. 



G. pecorum is certainly common in Denmark, but, like the other 

 species, the imago is not frequently seen. Boas (Tidsskr. for Veterin. 

 2, XXI) States that of Gastrophilus-laryæ pecorum is the one most 

 frequently met with, though eqiii and haemorrhoidalis are more 

 common than it as imagines. 



Geographical distribution: — Europe. 



2. G. equi Clark. 



1797. Clark, Trans. Linn. Soc. III, 226, Tab. XXIII, Fig. 7— 9, p.p. 

 {Oestrus). — 1805. Fabr. Syst. Antl. 228, 4 (Oestrus). — 1818. Fall. Dipt. Suec. 

 Haemat. 13, 18 {Oestrus). — 1824. Meig. Syst. Beschr. IV, 175, 1, Tab. XXXVIII, 

 Fig. 21—22 {Gastrus). — 1838. Zett. Ins. Lapp. 623, 1 et 1844. Dipt. Scand. III, 

 976, 1 {Gastrus). — 1862. Schin. F. A. I, 391. — 1863. Brauer, Mon. Oestr. 

 68, 1, Tab. I, Fig. 1, Tab. V, Fig. 1, Tab. VII, Fig. 1—3. — 1907. Kat. palåarkt. 

 Dipt. III, 593. — Oestrus hovis Linn. 1761. Fn. Suec. II, 1730. — 1775. Fabr. 

 Syst. Entom. 746, 1 et 1781. Spec. Ins. 398, 2. — Oestrus intestinalis De G. 

 1776. Ins. VI, 291, 1, Tab. XV, Fig. 13—19. 



Male. Frons broad, much broader than the eye. Frons yellow, 

 cheeks somewhat greyish, jowls yellow. Orbits and frons with yellow, 

 behind often darker brown hairs; cheeks and jowls with yellow, 

 not dense hairs, decumbent on jowls. Occiput yellow, below pale 

 greyish, with yellow hairs. Antennæ yellow, third joint somewhat 

 large. Thorax brown or blackish brown, behind black, sometimes 

 with two narrow brown stripes confluent to a brown space before 

 scutellum; humeri, sides and scutellum reddish brown. Thorax 

 with dense, erect yellowish or yellowish brown pile; behind the 

 suture a more or less marked transverse band of blackish or brownish 

 hairs. Abdomen yellowish or more or less dark brown, with some 

 more or less distinct dark spots along hind margins of the segments, 

 and with indications of three darker brown basal spots on each 

 segment, but often irregular or wanting; first segment blackish. 

 Abdomen is yellow-haired. Genitalia relatively large, arms of lower 

 forceps strong and broad, yellow with the apical half black and 

 polished. Legs yellow; hind trochanters prolonged into a triangular 



