118 



PARASITES OF THE D0:MESTIC ANIiNIALS 



Fig. 71. — Genus Notoedres. 



Notoedres cati, var. cati (Sarcoptes minor var. cali, Fig. 71), the 



chvarf sarcopt, is a small species having the body nearly spherical. The 



dorsal folds of the integument arc circular. The anus is dorsal. There 



are six anterior dorsal spinules and but twelve 



posterior. The arrangement of the stalked 



suckers is the same as in Sarcoptes scabiei. 



Course and Diagnosis. — Notoedric mange 

 of the cat usually begins about the ears and 

 upper part of the neck, extending over the 

 forehead and then over the head generally. 

 As a rule it remains limited to these regions, 

 rarely passing to the body. The disease fol- 

 lows the usual course and alterations of sar- 

 coptic mange, the cat giving evidence of the 

 mtense itchmg by frecjuentl}^ shaking the head 

 and wipmg it with its paws. In neglected 

 cases animals may become much emaciated 

 and may die in a few months. 



Due to the wrinkled, papular, and crust}^ 

 skin and its j^ersistencj' of location upon the head, the diagnosis of 

 this mange on the cat is not difficult. Its differentiation from other 

 itching skin diseases may be made certain by the discovery of the para- 

 site, which is readily obtamed in 

 material scraped from beneath the 

 crusts. 



Auricular Mange of the Cat. — 

 Auricular mange seldom occurs in 

 the cat. It is caused b}' the same 

 species of mite causing auricular 

 mange of the dog and is similar in 

 its symptoms and course. 



Scabies of the Rabbit 



Two species of scab mites afflict 

 the rabbit, — Notoedres cati var. cutii- fiq. 72.— Psoroptes communis var. 

 ■cult and Psoroptes communis var. cunicuU (from photomicrograph of 



funiculi (Fig. 72), the latter cans- ^lounted specimen, hyHoedt). 



ing auricular scabies or psoroptic otacariasis. 



In the rabbit notoedric mange most often has its beginning about the 

 nose, from which it extends to the upper part and sides of the head where 

 it remains localized. Its location, sjanptoms, and course are similar to 

 those of the same fornr of mange in the cat. 



Auricular scabies of the rabbit commences deep in the concha, grad- 

 ually involvuig the skin of the entire mner side. Its presence is first 



