174 DADD'S VETERINARY MEDICINE AND SURGERY. 
and smell it very anxiously ; and if they, by these means, dis- 
cover the fly, they immediately turn aside and hasten to a distant 
part of the field. I once saw, in a meadow or field, upon the 
cliffs of Margate, a fly of this sort teasing a horse that was con- 
fined to a small space by a spike stuck in the ground, to which a 
cord was tied. He could not get away from its attack, and became 
quite furious, for in kicking at the fly with his fore-foot, which he 
did vehemently, he often struck the bone of the lower jaw, creating 
excessive pain; for in that direction, while grazing, the fly comes 
to the beard of the lower lip. 
THE ESTRUS HEMORRHOIDALIS. 
1, The female about to deposit an egg. | 3. The bot. ' 
2. The egg magnified. I 4. The chrysalis. 
5. The male fly. 
The eggs of this species are difficult to be seen upon the horse’s 
skin or beard, owing to the agitation of the beast, and from the 
color of the egg being dark, like that of the skin of the horse. 
The animal has been generally too impatient, while undergoing 
this operation, to let me examine them very well. I ascertained, 
however, its form by pressing one of these eggs from the abdomen. 
The larvee, or grubs, of this species inhabit the stomach as the 
former, generally adhering to the white lining, and are disposed 
promiscuously in dense clusters, after the same manner. They 
may, however, be distinguished from them by being, in general, 
smaller and longer in proportion to their bulk. 
