92 Mites Injiirious to Domestic Animals. 



with, knob-like protuberances, like those present in certain non- 

 parasitic Gamasid mites (Gamasus, etc.). It measures slightly over 

 a millimetre in length. 



This interesting mite lives in the external ear of cattle, appa- 

 rently feeding on the waxy secretions. It is found both in North 

 America and Europe (France, Austria, etc.). In some localities it 

 seems to be fairly common. 



FIG 77. 

 Holothyrus sp. (p 93)., from below x 13. (After Thorell.) 



Genus Sternostomum, Trouessart, 1895. 

 Sternostomum rJiynolethrum, Trouessart, 1895. 



(Figs. 75 and 76.) 



This mite has been found living in the nasal cavities of geese in 

 France. It feeds on the blood of the host and may set up severe 

 inflammation of the nasal passages. Another species (Sternostomum 



