BOT FLIES OF HORSES, CATTLE AND SHEEP. 



soft tumor on the loins, and a small round hole in the skin at the 

 centre of it In the early spring the grubs may be squeezed out of 

 their burrows, and a little later force themselves out, and fall to the 

 ground and burrow into it, where they form pupae, or chrysalides, 

 and in time emerge as perfect flies. These pests should be removed 

 from the cattle's backs and destroyed. There is no other practicable 

 remedy. In the West the grazing cattle are so tormented by these 

 flies, that the hides are seriously damaged for the tanners' use, to the 



HORSE BOT FLY. 



CATTLE GAD OK BOT FLY AND LARVA. 



SHEEP BOT FLY. 



LARVA AND PUPA OF 

 HORSE BOT FLY. 



EGO OF HORSE BOT FLY, 

 NATURAL SIZE AND ENLARGED. 



LARVJE OF SHEEP BOT FLY, 

 SHOWING UPPER AND LOWER SIDES.. 



extent at times of fifty per cent. In this case no doubt a coating of 

 grease and tar on the backs of the cattle might be a preventive,, 

 if it could be applied. 



The Sheep Bot differs from the other two in its manner of annoy- 

 ance. It deposits a living larva or newly hatched egg, like that of 

 the Flesh Blow Fly, upon the sheep's nostrils. The small grub crawls 

 up the nostril into the nasal sinus and there attaches itself by hooks, 

 as does the Horse Bot Fly in that animal's stomach. Unless 

 numerous, these grubs seem to be little annoyance, but otherwise 

 the sheep suff er greatly and exhibit great distress, pawing the ground, 

 snorting and running about in frenzy. As with the others, remedies 

 are only preventive, and consist in smearing the sheep's noses with a 

 mixture of tar and grease, which remains sticky, and retains the grubs 

 upon its surface. A few furrows plowed in the field serve as a place 

 of security for the sheep, who instinctively push their noses into the 



