70 Mites Injurious to Domestic Animals. 



Fa:mily TYROGLYPHIDAE. 



Minute, pale-coloured mites, without any definite respiratory 

 system, their body is usually rather soft, being weakly chitinized. 

 They are mostly free-living, feeding on animal or vegetable matter, 

 especially if in a state of decay. A few species are associated with 

 mammals, living in their nests, and the travelling nymphs or hypopi 



Fig. .58. 

 Second nymphal stage (deutonj^mph) of Dennanyssus yallinae (p 87), 

 from belo^v. (Original.) 



of these forms usually have a special apparatus on the ventral 

 surface of the body for grasping the hairs of the host (fig. 36). The 

 travelling nymphs of other species bear discs provided with suckers 

 in the same position, enabling them to attach themselves to insects 

 (fig. 36). 



Several species of Tyroglyphids occur accidentally on the skin of 



