Oestrus. 85 



1, O. ovis Linn. 



1761. Linn. Fn. Suec. 1734. — 1805. Fabr. Syst. Antl. 230, 10. — 1824. 

 Meig. Syst. Beschr. IV, 165, 1, Tab. XXXVIII, Fig. 16. — 1844. Zett. Dipt. 

 Scand. III, 970, 1 {Cephalomyia). — 1862. Schin. F. A. I, 393. — 1863. Brauer, 

 Mon. Oestr. 151, 1, Tab. III, Fig. 1, Tab. VI, Fig. 1, Tab. VII, Fig. 10. — 

 1907. Kat. palåarkt. Dipt. III, 591. 



Male. Frons a little broader than the eye, widening downwards. 

 Orbits yellowish brown, densely covered with black impressed dots. 

 Face and jowls yellow, cheeks somewhat greyish, jowls and cheeks 

 with some small, impressed but not black dots. Frontal stripe brown, 

 widening downwards. Orbits and cheeks with not dense, yellow hairs; 

 jowls with few fine, yellow hairs. Occiput yellow, greyish or whitish 

 above and here with black dots; it is sparingly yellow-haired. An- 

 tennæ yellow with third joint black; arista yellow. Thorax yellow 

 or brownish yellow, dull, with four black stripes, the median ab- 

 breviated behind, the lateral broader, interrupted at the suture; 

 the stripes often slightly marked as thorax is densely covered with 

 black tubercles, the larger of which are more or less furrowed; on 

 scutellum they are more scattered but large at hind margin. Thorax 

 is sparingly clothed with yellowish to blackish hairs, placed on the 

 tubercles; scutellum with few hairs. Abdomen whitish, black and 

 brownish marbled, dull, the spots shifting according to view; often 

 the segments have narrow, whitish to brownish hind margins. Ab- 

 domen is sparingly clothed along the middle and at apex with short, 

 somewhat strong, black hairs, the lateral parts are bare, but at the 

 base and at side margins are long yellow or white hairs, also present 

 on the ventral parts of the tergites. Legs yellow, and yellow to 

 brownish-haired, with some black hairs. Wings clear; veins brownish 

 yellow; at base there are three black spots on the veins, placed in 

 a triangle; first posterior cell petiolate. Squamulæ white. Halteres 

 whitish yellow. 



Female. Similar; frons much broader, more than double as 

 broad as the eye, with parallel margins, and with the impressed 

 dots fewer and much larger than in male. Eyes smaller and posterior 

 eye-margin somewhat swoln. 



Length 10 — 11 mm. 



O. ovis is not rare in Denmark and I think present in most 

 piaces where there are sheeps; these are, however, much less infested 

 than the cattle of Hypoderma. The imago is rather rarely seen; we 

 have it from near Copenhagen, from Silkeborg and Skagen, taken 



