DIPTERA. 67 
fore-legs, and their noses nearly in contact with the ground. 
When these poor beasts are in the open country, they are observed 
assembled with their nostrils against each other and very near 
the ground, so that those which occupy the outside are alone 
exposed. The Cephalemyia ovis (Fig. 49) has a less hairy head, 

Fig. 49.—Cephalemyia ovis. 
but larger in proportion to the size of its body than the Gad-fiy 
(Gasterophilus equi). Its face is reddish, its forehead brown with 
purple bars, its eyes of a dark and changing green, its antennz 
black, its thorax sometimes grey, sometimes brown, bristling with 
small black turbercles, the abdomen white, spotted with brown or 
black, and the wings hyaline. 
The Cephalemyia (CEstrus) ovis is to be found in Europe, 
Arabia, Persia, and in the East Indies. It lays its eggs on the 
edges of the animal’s nostrils, and the larva lives in the frontal 
and maxillary sinuses. It is a whitish worm, having a black 
transverse band on each of its segments. Its bead is armed with 
two horny black hooks, parallel, and capable of being moved up 
and down and laterally. Underneath, each segment of the body 
has several rows of tubercles of nearly spherical form, surmounted 
by small bristles having reddish points, and all of them bent 
backwards. ‘These points,” says M. Joly, “probably serve to 
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