Mites Injurious to Domestic Animals. 97 



the power of flight and becomes a crawler. So far apparently 

 Acarapis woodi * has been found only in English bees. It is obvious 

 that this mite has long been a specialised parasite of the honey bee 

 or some allied insect, and it is very remarkable that its presence in 

 the tracheal tubes has so long been overlooked by workers on the 



PIG. 80. 



Acarapis woodi. Ventral view of female, X 443. 

 (After Hirst, Ann. Mag. Nat. Hist., June, 1921.) 



diseases of bees. So far no one has succeeded in finding Acarapis as 

 a parasite of any other insect, but the possibility that this is 

 the case should be borne in mind. It is not known how infection 



* According to Vitzthum, Dr. Ellinger of Weimar has reported that the 

 disease has made its appearance in Germany also (Bayerische Bienenzeitung , 

 April, 1921). 



