186 



SANITARY EXT():\r()LOGY 



Plate XIII.— Method of Mttack l)y the cattle liot, or heel fly, Ili/poderma linmUi. Fig. 

 1 (upper right).— Fly ovipo.siting on cow's leg. Fiir. 2 (upper left).— Portion of 

 cow'.s hack showing larvae, empty holes and pus exudate. Fig. 3 (lower).— Heav- 



ily infested 



cow. 



(Bishopp.) 



