Bui. 597, U. S. Dept. of Agriculture. 



Plate III. 



Protection from Bot Flies. 



Upper.— Horses assembled for protection during ovipositions of Gastropidlus hacmorrlioidalis. 

 Center. — A method of protecting lips from ovipositing G. hacmorrhoidalis. Lower. — Protect- 

 ing under jaws from ovipositing G. nasalis. (Original.) 



