INSECTS INFESTING DOMESTIC ANIMALS. 358 



The perfect fly (Fig. 864) is of a black color, thickly 

 covered with hairs except on the thorax, which is twice 

 broadly banded with yellow and white ; at the base of the 

 abdomen is a Avhite or yellow Imnd, and at the tip is a band 

 of reddish hairs. This species causes great annoyance to 

 cattle in pastures. It is said that the buzzing noise made by 

 the fly terrifies work oxen to such an extent that they at times 

 become unmanageable. 



Hare, or Jack Rabbit. 



A species of CEstnis attacks the hare, or jack rabbit; the 

 habits and natural history of this cestrus are probably similar 

 to that of the ajstrus bovis. 



Remedy. — The opening of the tumor may be enlarged with 

 the point of a sharp knife, and the maggot extracted, or 

 forced out ; this can be done Avithout much pain to the animal. 



CHAPTER CCXLVII. 



The Sheep Bot-fly. 



( (Estrus ovis. — Linnaeus.) 



Order, Diptera; Faanily, CEstrid.e. 



[Living in the heads of sheep ; a Avhitish footless maggot.] 

 It is thought that the parent insects (Fig. 365, -? and 3,) are 

 viviparous, and that the maggots (Fig. 365, 4, 5 and 6,) are 

 lirought forth alive, and are deposited in or near the nostrils 

 of the sheep, up which they crawl until reaching the frontal 

 sinuses, where they attach themselves by means of the hooks 

 witli which their heads are provided. Here they remain until 

 attainning their full size, when tliey loose their hold and make 

 their way to the opening of the nostrils and then fall to the 

 ground, which they enter, and soon contract to dark brown 

 pupa (Fig. 365, 3,) from which the perfect fly issues in a few 

 weeks. 



