658 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



or by darkening the stables. It is accomplished to some extent 

 by the use of fly nets, most of which are of little use, or other 

 covers for the animals. It is also accomplished by the use of 

 repellant substances sprayed on the animals, but this process 

 usually affords only temporary relief and is troublesome and 

 expensive. Proper care of straw to prevent its becoming scattered, 

 wet and rotten, will prevent breeding to a large extent. On the 

 whole, the best control will be secured by the use of fly-traps in 

 the stable windows and the disposal of such wastes as may furnish 

 breeding places as promptly as conditions permit. 



The Horn Fly * 



In appearance the horn fly is very much like a small house fly 

 but its mouth parts are similar to those of the stable fly and are 



FIQ. 579. The Horn fly: a, 



U. 



>, larva; c, pupa; d t adult. 

 Dept. of Agr.) 



Moot lift 



(After Marlatt, 



used to good effect to the same purpose. It attacks cattle for the 

 most part and is found clustered in large numbers about the horns, 

 on the shoulders and flanks of cattle in pasture all through the 

 summer. It is possibly the most annoying of the flies, attacking 

 cattle, and is certainly responsible for loss of weight and reduction 

 in the milk flow so noticeable in the fly season. 

 * Haematobia serrata R.-D. Family MuscidcB. 



