Bul. 597, U. S. Dept. of Agriculture. PLATE IV. 
SECONDARY INJURY FROM BoT FLIES. 
Upper.—Horses rubbing following ovipositions of Gastrophilus haemorrhoidalis. _Lower.—Lower 
lip of horse showing barbed wire cut at the lower extremity which resulted from rubbing. 
The small holes are injury from the grass Hordeum jubatum. (Original.) 
