92 Jlliies Injurious to Domestic Animals. 



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

 parasitic Gamasid mites (Gcmiasus, etc.). It measures slightly ovei 

 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 Stentostomum, Trouessart, 1895. 



Sternostomum rhijuolelhrum, 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 



