226 HEEL-FLY. 
THE OX WARBLE-FLY. 
([ypoderma bovis 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 usually mistaken for it is the following species. 
THE STRIPED WARBLE-FLY OR HEEL-FLY. 
(Hypoderma lineata 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 them. It resembles a small black bee. The 
black and polished thorax is covered with yellowish-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 
