INSECTS AFFECTING MAN AND ANIMALS 191 



dilute carbolic acid, one part to thirty of water, by rubbing 

 the eggs over lightly with kerosene, or by clipping the hair 

 or shaving the eggs off with a sharp razor. Farmers some- 



FIG. 134. Portion of stomach wall showing points of attachment of 

 bots. (After Osborn, U. S. Dept. Agr.) 



times hang a piece of frayed rope from the throat-latch of a 

 horse in pasture, and claim that the flies will deposit most of 

 their eggs on it, and thus do no harm to the horse. If there 

 are indications of the bots doing 

 such serious injury as to require 

 internal treatment a veterinarian 

 should be consulted. 



118. The Sheep Bot-fly or Head 

 Maggot.* The sheep bot-fly looks 

 something like an overgrown house 

 fly, the upper part of the head and thorax being dull yellow, 

 covered with small specks so as to give it a brown appearance, 

 * (Estrus ovis Linn. Family (Estridae, See page 139. 



FIG. 135. Horse bot-fly. 



