uo 



DIPTERA OF MINNESOTA. 



attention of a good A^eterinarian. The means of prevention are prac- 

 tically the same as in the first described species, G. equi. Painting 



I'ig. 124. Nasal Bot Fly. Greatly enlarged. Lugger. 



the eggs every few days, when a horse has been exposed, with pure 

 kerosene, would probably prove sufficient, but a mere combing or 

 use of a brush is not sufficient with the bot, or with any other laying- 

 eggs on the hairs. Repulsive ointments on lip or nose would be of 

 service where the animals are running in pasture. 



THE SHEEP BOT FLY, SHEEP GAD FLY, "GRUB-IN-THE-HEAD," 



-FALSE GID." 



Oestrus oz'is. 



This bot fly, dull yellow in color, looking a little like a large house 

 fly, and having no mouth, places its living young (the eggs having 

 been hatched in the body of the parent) in the nostrils of sheep. The 

 attempts of the female fly to reach this point drive the poor animals 

 frantic. They lie down, bury their noses in the dust, throw dust in 

 the air, huddle together, etc. The young larva, once in the nose, 

 works its way upward, occasionally gaining lodgment in the frontal 

 sinuses, cavities between plates of bone over the eyes. Ten months 



