226 HEEL-FLY. 



THE OX WARBLE-FLY. 



{Ilypoderma hovis DeGeer). 



This species is the best known of all warble-flies and is 

 the one most frequently described. Yet it seems doubtful 

 whether it is found in the United States. The one that has 

 been most usualh' mistaken for it is the following species. 



THE STRIPED WARBLE-FLY OR HEEL-FLY. 



( Hypoderm a Uneata Villers ) . 



This species is illustrated in fig. 183. It is a very hairy 

 insect, and characterized by four lines upon the thorax, 



Fig. 183.— Heel-fly. Enlarged. Original. 



which lines are by no means as well defined as some illustra- 

 tions show thein. It resembles a small black bee. The 

 black and polished thorax is covered with 3'ellowish-white 

 hairs; the region about the scutellum is black, then follows a 

 white band of hairs covering two rings of the abdomen, then 

 a broad black band, while the posterior end is again 

 whitish. 



Remedies. — Here again the best remedy is prevention. 

 The eggs can be discovered without very much trouble, at 



