12 



COMMON NAMES. 



This insect lias been called the Horn Fly because of its habit of 

 resting on the horns of the cattle. Other common nanies are the 

 Cattle Horn Fly, the Cow Horn Fly. the Texas Fly, the Buffalo Fly, 

 and the Buffalo Gnat. 



POPUI>AR DESCRIPTION OF THE FLY. 



FiGURK 1.— a, egg; b, imago; c, head from the side; d, mouth parts. All greatly 

 eulargeil. (After Smith.) 



This fly (Fig. 1. b) resembles the common house fly in general 

 appearance, but is much smaller, being about one-third of an inch 

 long. " It is of a dark gray color with a yellowish sheen, and the 

 body is covered with minute black bristles. The head consists 

 almost entirely of the dark-red, silvery-edged eyes, but bears on its 

 lower surface the black dagger-shaped tongue which is the cause of 

 so much torture to cattle." 



LIFE HISTORY OF THE INSECT. 



The female deposits iier eggs (Fig. 1, a) singly on fresh cow 

 manure, usually during the warm part of the day. The eggs are 

 about one-twentieth of an inch long and of a brownish color. They 

 hatch in about 24 hours and the young maggots burrow down into the 

 dung where they feed, and reach their full growth in about a week, 

 when thev are of the form shown in Fig. 2, 1. Thev then descend 



