926 



DISEASES OF SHEEP. 



and lays its eggs there, and when they are changed into larvae the 

 death of the victim ensues under terrible conditions. 



On the extreme left, in Fig. 1242, is represented the larva of 

 this singular animal ; next, one of the horny mandibles with which 

 the larva is provided ; and on the right, the head of the larva, greatly 

 enlarged. 



Pig. 1244.— Foot-louse. 



Fig. 1243.— The Tsetse Fly (Glosslna Morsitans). 



The othei; insect referred to is 

 the Tsetse Fly, shown in Fig. 1243, 

 which is a native of Central Africa.' 

 It is brown, with transverse yellow 

 stripes across the abdomen. It is 

 not dangerous to man, but attacks 

 cattle, sheep, and, other, domestic 

 animals, upon which it darts from 

 the top of a bush with the rapidity 

 of an arrow. The African cattle and sheep recognize it at a great 

 distance by its buzzing, and are thrown into great consternation 

 thereby. The poison is not injected with a sting, or by eggs de- 

 posited beneath the skin, but the proboscis is inserted into the skin, 

 and the venom thus conveyed into the system of the victim, which 

 does not immediately suffer more than from the bite of a mosquito ; 

 but in a few days the eyes and nose begin to run, a swelling appears 

 under the jaw, and emaciation begins, and proceeds unchecked un- 

 til, in a month or so, purging comes on. and the animal finally 

 perishes from exhaustion. 



