EMASCULATING-FLIES. 229 
segment has its anterior half covered with exceedingly short 
whitish hairs, in which are found a few spots showing the 
polished surface below. The legs areblack and covered with 
short black hairs. As it does not agree with the description 
given of Cuterebra emasculator Fitch, it deserves a scientific 
name and C. sterilator is proposed for it. 
Another large fly, illustrated in fig. 186, was captured 
ZF 

O . 
Fig. 186.—Cuterebra baccata. Enlarged. Original. 
in the prairie region of Minnesota; it seems to be C. baccata, 
an insect said to produce the large maggots found so fre- 
quently in the neck and other parts of our three species of 
hares. Fig. 187 shows a still larger fly, remarkable on ac- 

Fig. 187.—Cuterebra horripilum Clark. Enlarged. Original. 
count not only of its large size, but also of the dense yellow- 
ish-brown fur upon the thorax. It is C. horripilum of Clark. 
Still another species, entirely black, and almost as large as 
the fly shown above is found in our prairies. The his- 
tory of all is obscure, and possibly a number of these flies 
