88 Tachinidae. 



it seems, however, that it is the tickling of the fly which causes the 

 behaviour of the cattle. H. lineatum has much less influence on the 

 cattle (Hadwen) and likewise the species of Cervus do not seem to 

 be so influenced by the egg-depositing of their parasites. 



Small larvæ of Hypoderma have sometimes been found on man; 

 three cases are known from Denmark, but in Norway they have 

 occurred more numerously; the larvæ generally do not become 

 fully developed. Also on horses they have been found in some instances. 



Of the genus six species are described from Europe, besides 

 some larvæ; two species occur in Denmark. 



Tcfble of Species. 



1. Thorax yellow-haired in front of the suture, black-haired 

 behind, the two bands sharply separated; femora black, tibiæ 

 blackish brown or brown, mainly black-haired 1. bovis. 



— Thorax all or mainly yellow-haired; tibiæ yellow to brownish 



yellow, posterior legs for a great part yellow-haired 2. lineatum. 



The larvæ seem to be distinguishable by the sixth and seventh 

 abdominal segment (the two before the spiracle-bearing) having no 

 spinules at posterior margin of segments above and the seventh none 

 below in bovis, while these segments have spinules in lineatum. 



1. H. bovis Linn. 



1761. Linn. Fn. Suec. II, 1730 (larva) (Oesfnis). — 1805. Fabr. Syst. 

 Antl. 228, 3 (Oestrus). — 1818. Fall. Dipt. Suec. Haemat. 11, 4 (Oestrus). — 

 1824. Meig. Syst. Beschr. IV, 167 (Oestrus). — 1844. Zett. Dipt. Scand. III, 

 974, 4 (Oestrus). — 1862. Schin. F. A. I, 396. — 1863. Brauer, Mon. Oestr. 

 124, 5, Tab. II, Fig. 2, Tab. V, Fig. 4, Tab. VIII, Fig. 1 a, 7. — 1907. Kat. 

 palåarkt. Dipt. III, 586. 



Male. Frons broader than the eye. Orbits blackish, yellowish 

 just on anterior part, the face whitish or greyish, towards the sides 

 more brown and jowls brown. Frontal stripe brown or blackish. 

 Orbits with erect hairs, yellow in front, but darker to black on the 

 black parts of orbits; all the face with downwards directed, yellow 

 or pale yellow hairs; the narrow cheeks with erect hairs. Occiput 

 greyish black, palest below, with yellow hairs. Antennæ yellowish 

 to brown, third joint sometimes blackish, nearly globular, more or 

 less hidden in the calicular second joint. Thorax black, dull, with 

 four black, shining stripes, interrupted at the suture, the median 



