ox WARBLE FLY. 



69 



extremity in the opening of the boil-like swelling, 

 commonly known as the " Warble." 



Here it draws in air through what look like two 

 small black spots in the tail, but which are really the 

 spiracles, or masses of minute breathing openings, by 

 which air is admitted into the breathing-tubes or 

 trachece of the maggot. It feeds by sucking in the 

 putrid matter flowing into the cavity its presence has 



Fig. 56. — Muscles of maggot, 

 much magnified. 



J if ' SAli^*"^ 



Fig. 57. — Prickles of maggot, 

 much magnified. 



caused, and there it remains until it is full grown, 

 that is, about an inch long. This may be at any 

 time from May to much later in the season, and then, 

 with the help of the rows of prickles with which it is 

 furnished outside, and the powerful net-work of 





Fig. 58. — Section of Warble, after soaking in water. 



muscles with which it is furnished within the skin, it 

 •drags itself through the opening of the Warble, tail 



