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



Plate V. 



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Devices in Use to Protect Work Horses from Ovipositing G. Haemorrhoidalis. 



Upper left. — A leather f rings is fairly effective. Upper right.— A burlap fringe hinders breathing. 

 Lower left. — A wire basket often permits ovipositions on account of coarse mesh and ill fitting. 

 Moisture and dust collect and hinder breathing. Lower right.— A strip of leather actually 

 covers oviposition places and allows the horse to breathe easily. (Original.) 



