•2*J 



I)wiiaiie(.' of a ban-e S]>ot about the ueelc O'l- ou the head. 

 The feathei'S become dry and brittle and either break 

 off or fall out. Then tlie skin becomes covered with 

 .Yellowish scales which giadually increase in thickness 

 as the disease advances until they sonietimes reach a 

 thickness of an eiahtli of an inch. AVlien old, these 



The Parasite of One Form of Body— Mange of F'owls. 

 Epidermoptes hiJofiatiix, Female -150 times actual size. 



scales are grayish and have the appearance of thick 

 scabs. If they are pulled off it is found that the skin 

 beneath is red and bleeds easily. As a rule these 

 areas do not ilch, but sometimes they do, and then the 

 bird scratclies them vijxorously. After becominp: es- 

 tablished about llie head and neck the disease may 

 spread io the body and sometimes covers a very large 

 surface. The symplonis of this affection resemble 

 those of fiivus so close] v that it has been thought bv 



