THE MITES 113 



Scabies of the Goat 



Goats may be affected by three forms of scabies, — sarcoptic, psoroptic, 

 and chorioptic. The first mentioned is the most frequently met with in 

 these animals, having its seat, as in sheep, mainly about the face. The 

 other forms are rarely met with in goats. Psoroptic scabies attacks the 

 external ear, forming dark-colored, fungus-like scabs. Chorioptic scabies 

 is said to have its beginning on the sides of the neck and withers and 

 along the back. 



Scabies of Cattle 



Three forms of scabies affect cattle. These are as follows : 



1. Psoroptic scabies, due to Psoroptes communis, var. bovis. 



2. Chorioptic scabies, due to Chorioptes communis, var. bovis. 



3. Sarcoptic mange, due to Sarcoptes scabiei, var. bovis. 



Scabies is less frequent in cattle than in horses and sheep, in North 

 America being most often met with in the range herds of the West and 

 Northwest. In this country the psoroptic is probably the most fre- 

 quent form. 



Psoroptic Scabies of Cattle. — This usually has its beginning upon 

 the sides of the neck and shoulders, at the base of the horns, or it may 

 be at the root of the tail. From these points it usually advances along 

 the back, passing to the sides, and in severe cases eventually involving 

 the greater part of the body. In its symptoms, course, and skin altera- 

 tions it is in all essential respects analogous to the same form of scabies 

 in the horse. The pruritus is intense, the animal rubbing and scratching 

 itself in every way possible, often causing bloody excoriations of the 

 skin. As the disease advances an extreme cachexia sets in, and the 

 anaemic and much weakened animal may die in a most miserable con- 

 dition. 



Such cases are most hkely to occur about the close of the winter 

 months, especially in cattle stabled or herded together in warm quarters. 

 While upon grass, though the infection may remain, its symptoms sub- 

 side, and in the falling away of the scabs with renewal of the coat, may 

 even seem to have entirely disappeared. 



Calves, yearlings, and two-year-olds suffer most, and it is among 

 these that there is more likely to be a fatal termination. 



Chorioptic Scabies of Cattle. — This form in cattle is commonly 

 known as tail mange. It generally appears in the depressions at the 

 base of the tail where as a rule it remains locaUzed. If neglected it may 

 spread to the loins, perineum, and inner surface of the thighs, or even 

 over a considerable surface of the body, though such cases are rare. It 

 is exceptional for mange to appear in the feet of cattle. 



Its course is the usual one of chorioptic scabies. The itching is mod- 



