Mites Injurious to Domestic Animals. 73 



mites of those animals, or being sometimes themselves parasitic or 

 pilicolous (Psorergates fig. 39 a, Myobia fig. 39 b, etc.). 



Genus Cheyletiella, Canestrini, 1886. 



In the genus Cheyletiella the palp is stout, ending in a prehensile 

 claw, used to grasp the feathers or hairs of the host. 







FIG. 61. 



Larva of Dermanyssus gallinae (p. 87), x 154; drawn from living 



specimens. Note the minute conical tooth at posterior end of 



body used for piercing the egg-shell. (Original.) 



Cheyletiella parasitivorax, Megnin, 1878. 



Apparently C. parasitivorax (fig. 40) is the only species that 

 lives on mammals. It can readily be distinguished from the other 

 members of the genus] by the absence of claws, which have dis- 

 appeared, for there are only combs at the end of the feet. 



