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 larve 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 
Fic. 596.—The Horse Bot-fly, 2 Solution of carbolic acid 1 part, water 
Slightly enlarged. Original. 30 parts. 
The Sheep Bot-fly (@strus 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. 
Fic. 597. — Larva of the Sheep Bot- 
fly. Slightly enlarged. Original. 
The Ox Warble ( Hypoderma 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. 
