170 DISK ASKS OK POrLTKV. 



comes, apparently at least, a permanent parasite. 

 According to Zurn, these mites sometimes enter the 

 nasal cavities of young pigeons and chickens and set 

 up a catarrhal inflammation, and they have also been 

 found in the external opening of the ear. 



The red mite may get upon people and cause con- 

 siderable itching and some irritation of the skin ; 

 and it ma}', also, attack horses and other animals 

 stabled near tlie poultry- -roosts. It causes horses to 

 rub and bite themselves, the hair over the affected 

 places is lost, and there is an eruption similar to that 

 which occurs in the common mange. 



The epizoa of our second group are all mites. The 

 Epidcrmoptes cause a form of scabies characterized by 

 the production of dr}-, grayish -yellow crusts or scales. 

 The disease is seen on anj"- part of the body, but only 

 rarely about the head. 



The Sarcoptes Icevis produces the true scabies of 

 fowls and pigeons. The skin is not much affected but 

 the feathers break and are shed from the affected sur- 

 faces. This disease and tiie scabies of the legs will 

 be treated with all necessary detail at the end of the 

 general article on the epizoa. 



The animal parasites, which live in the connective 

 tissue and air sacs might, perhaps, be more properly 

 placed among the entozoa. They are all mites, and 

 some of them pass a portion of their existence upon 

 the surface of the body. It is most convenient, there- 

 fore, to consider them in connection with the other 

 mites. The Cytoditcs nudus lives in the air sacs and 

 connective tissue of fowls and pheasants. They are 

 found in the trachea, bronchi, lungs, and the various 

 air sacs including those of the bones. They have also 

 been reported as found in the thoracic and peritoneal 



