MITES INJURIOUS TO DOMESTIC ANIMALS 



Sub-order SARCOPTOIDEA. 

 Family SARCOPTIDAE. 



The mites of this family, commonly called itch mites, are very 

 small, whitish, and in shape oval or round. They are usually 

 considered to be without tracheal tubes, but in the genus Otodectes 

 (fig 1), and possibly in other members of the family, these are 

 present. 



Fig. 1. 



Otodectes cynotis, var. felis, showing distribution of tracheal tubes, x 142. 



(a) Portion of tube greatly magnified to show striation. (After Hirst, 



Journ. Quekett Microscopical Club (2) xiv, Nov. 1921.) 



Genus Psoroptes, Gervais, 1841. 



The genus Psoroftes differs from the allied genera ChoriojMs 

 (formerly known as Symbiotes) and Otodectes in having the terminal 



