120 HORSE AND CATTLE FLIES. 
phagus ovinus, are wingless, somewhat flat in shape, and leathery in 
texture, bristly, especially on the abdomen and legs, and of a brownish 
colour, varying in tint on different parts of the body and legs, and 
more or less tinged with grey on the abdomen. When seen in the 
wool they greatly resemble small spiders. 
The head is squarish, rather wider than the thorax, in which it is 
partially sunk, and is furnished with a long proboscis; the eyes are 
remarkably small; the ocelli, or simple eyes, wanting; and the 
antenne, or horns, which are very short and sunk in pits, are wart- 
shaped at the ends. 
The thorax, as seen from above, is square and without wings, and, 
so far as observable, also without poisers. The abdomen is much 
contracted at the base, then enlarged into a flattish bag-shape, and 
more or less concave at the tail extremity. The feet, like those of the 
Forest Fly (H. equina), are terminated by a pair of strong black curved 
claws, each furnished with a much shorter and lumpy, or somewhat 
thumb-like, side claw, and a bearded bristle or feather-like appendage— 
of the same nature as the ‘“‘ bearded hair” of the Forest Fly’s foot 
(figured and described in the foregoing paper), but much shorter, 
and broader in proportion, and the plumes of the feather, or hairs 
of the bristle, more definitely arranged on each side of the centre—is 
very observable. 
Two good figures of this process are given by Dr. Cooper Curtice in 
plate iv. of his ‘Animal Parasites of Sheep,’ of which one shows 
the foot ‘with the two claws, between which hangs the pinniform 
prehensile organ”’; also ‘‘ the tarsi, whose last joint supports the pre- 
hensile organ”; this magnified sufficiently to show the structure. 
The other figure, magnified sixty times, shows the prehensile organ 
separately in greater detail—that is, the segmented muscular portion 
included within the tarsus, and the feather-like ‘flexible grasping 
portion.”’ * 
The lower edge of the curved claw is notched below in the same 
manner as that of the H. equina and H. maculata, but, as far as I 
find, not so markedly. ‘The teeth, so to call them, are rounder and 
shallower, and I could not certainly distinguish the file-like side 
markings. Possibly, however, this might be from not examining into 
this part of the structure until the specimens had dried. 
These flies belong to the division of the Pupipara. The maggot is 
hatched within the mother fly from an egg, according to Leuckart, 
long and slender, varying from one millimétre and a half to 
slightly more in length, and rather more than half a millimétre in 
* «The Animal Parasites of Sheep,’ by Cooper Curtice, D.V.S., M.D. United 
States Department of Agriculture. Washington: Government Printing Office. 
1890. (Paper on ‘Sheep Ticks,” pp. 89-44.) 
