BOT-FLIES. 217 



in front of the suture, and with black ones behind, which 

 form a well-marked transverse band; the abdomen is cov- 

 ered \\nth whitish hair in front, with black ones in the mid- 

 dle and w^ith orange-colored ones behind. The flj^ is smaller 

 than the one described before, measuring from 9 to 11mm. in 

 length. 



Judging from the description given of the habits of this 

 fly it seems that they are almost identical with those of the 

 larger bot-fly. It is stated that the female prefers to deposit 

 her eggs on the lips of the horse, and on the long hairs cov- 

 ering them. This, of course, greatly irritates the animals, 

 which is shown by their rubbing their lips against the 

 ground, the fore-limbs, or trees. The eggs are said to be 

 darker than those oi eqal. The adult larva:* are smaller and 

 deeper red, and they have also the habit of remaining for 

 some time in the folds of the rectal mucous membrane, where 

 they assume a greenish color before leaving the infested ani- 

 mal. The young larvae of this species may sometimes fasten 

 to the epiglottis and in the pharynx, and thus can become 

 dangerous to the horse. 



THE NASAL BOT-FLY. 



( Ga8troj)Julus nasalis Linn.). 



This species of bot-fly is illustrated in fig. 179. The up- 

 per surface of the thorax is clothed with dark hairs inter- 

 mixed with others of a golden color; the anterior portion is 

 much lighter colored, and fairly sharply separated from the 

 ■darker posterior portion. The shining scutellum is of a dark- 

 brown, bright-brown, or a chestnut color. The color of 

 the dense hair covering the abdomen varies in the different 

 specimens; in the example illustrated it is white on the 

 second, black on the third, and orange on the last segments. 

 The wings are hyaline, and small for the size of the fly, 

 which measures from 12 to 13mm. 



The elliptical white eggs are truncated in front, and are 

 most frequently deposited upon the wings of the nose and 

 on the lips of horses, hence the scientific name nasalis. 

 Meigen and B. Clark designated this fly by such names as 

 ■salutaris and salictlfenis, to express the unfounded belief 



