INSECTS INJURIOUS TO DOMESTIC ANIMALS, ETC. 663 



Full grown larvae of all species drop to the ground and pupate 

 in the soil. 



Work horses and horses kept in stables and given daily care can 

 be protected from bot flies by treating the eggs every few days with 

 benzine, kerosene or carbolic preparations or by clipping the hair. 

 Horses in pastures or on the range, especially colts which are most 

 frequent sufferers, can not be so easily protected. Mechanical 



FIG. 582. Horse protected from attack of bot-flies. After Dove, U. S. Dept. 

 of Agr. 



devices have been suggested to protect the animals, especially 

 from the nose fly. A muzzle which has given some protection is 

 copied from W. E. Dove, I. c. (See Fig. 582). 



If animals be furnished shelter which is somewhat darkened 

 for the daylight hours and be encouraged to graze at night, con- 

 siderable protection will result since the bots are active only 

 during the daytime. 



Internal treatments to rid the infested animals of bots have 

 been tried. The one recommended by the Department of Agri- 

 culture is quoted below from Dove. 



