Mites Injurious to Domestic Animals. 25 



coatimundi, hartebeest, kudu, guinea-pig, and rabbit without being 

 able to find a constant morphological character by which they 

 could be satisfactorily distinguished from one another. 



The skin complaints induced by the various forms of Sarcoptet! 

 occurring on domestic animals are briefly described below. 



For the sake of convenience the three principal kinds of mange 

 in the horse due to Sarcoptid mites are placed together, see page 34. 



Sarcoptic Mange of the Dog. — Sarcoptic mange is apparently 

 less common in dogs than the mange due to Demodex, but is more 

 frequently met with in some countries than others. It is very 

 much easier to cure than demodectic mange. Apparently the 

 mange caused by Sarcoptes can makb its appearance on any part 

 of the body, but most frequently commences on the head. It 

 spreads rapidly, and in a few weeks large areas of the skin may 

 be invaded by the parasite. The symptoms are very like those of 

 demodectic mange. There are reddish spots rather like flea bites, 

 and the scratching of the animal causes reddish places and papules 

 to appear. The infected part often becomes dry and covered with 

 yellowish crusts. The hair falls out and the skin becomes thickened, 

 wrinkled and creased. Pruritus is intense. Sarcoptic mange is 

 easily confused with the mange caused by Notoedrus cati and by 

 Demodex, and also with several other skin complaints such as 

 eczema, etc. The presence of the jjarasite is the chief distinctive 

 feature. 



A number of cases of human beings becoming infected with the 

 Sarco2}tes of the dog {Sarcoptes scabiei, var. cards) have been recorded. 



Sarcoptic Mange in Cattle.— The sarcoptic mange of cattle 

 has been very prevalent in some areas in the United States, and is 

 usually treated by four dippings in lime sulphur, the interval between 

 the dippings being from six to ten days. This kind of mange in cattle 

 has also been a great nuisance in Alberta and Saskatchewan, where 

 it has been combated by dipping, movement of cattle in the infected 

 areas being prohibited, except when they are destined for immediate 

 slaughter. In Britain, sarcoptic mange in cattle seems quite common 

 in Scotland, and also occurs at Liverpool, and doubtless in other 

 areas. Milkers often contract sarcoptic mange from cows, the 

 arms, chest, and neck being affected. The complaint is known as 

 " dairyman's itch." 



Sarcoptic Mange in Pigs.— In pigs sarcoptic mange usually 

 st&,rts on the head, especially round the eyes and ears, but the back, 



