372 



PESTS OF DOMESTIC ANIMALS 



mer, and fastens its eggs to the hairs of the animal's shoulders or 

 fore legs. The eggs are yellowish in color and plainly visible. They 



are hatched by the action of the ani- 

 mal's tongue in licking itself, and are 

 carried by the tongue to the mouth, 

 whence they reach the stomach. When 

 full grown, the larvae pass out and 

 pupate in the soil. 



Examine the stock once every two 

 weeks during summer, and if eggs are 

 found, shave them off with a sharp knife 

 or moisten them with kerosene, or with 

 Fig. 596.— The Horse Bot-fly. ^ solution of carboHc acid 1 part, water 

 Slightly enlarged. Original. 30 parts. 



The Sheep Bot-fly {(Estrus ovis Linn.) 



The maggots of this species develop in the upper nasal passages of 

 sheep, sometimes penetrating the brain. Living young are deposited 

 in the nostrils by the adult flies in 

 June and July. The mature mag- 

 gots work their way out through 

 the nostrils after ten months and 

 pupate in the ground. 



Finely powdered lime is used to 

 induce sneezing, so as to dislodge 

 the maggots. The same result is 

 secured by dipping a feather in tur- 

 pentine and running it up the nos- 

 trils. A mixture of tar and grease 

 or other repellent may be smeared on the nose to keep off the adult 

 flies, but is not entirely effectual. 



Fig. 597. — Larva of the Sheep Bot- 

 fly. Slightly enlarged. Original. 



The Ox Warble (Hypodernia lineata Villers) 



The ox warble is a species of bot-fly, which spends the latter part 

 of its larval stage as a fleshy, footless grub beneath the skin of the back. 



