152 ENTOMOtOGICAL NEWS. [April, '15 



E. rhois Steb. New Brunswick, Highland Park, Nutley, English- 

 town and other parts of state. On upper and lower surfaces 

 of Rhus radicans. Poison ivy mite gall. 



E. salicicola Garman. New Brunswick, Somerville and other 

 parts of state. Galls on upper surface of willow leaves. 



E. semen Walsh. New Brunswick, other parts of state. Galls on 

 upper and lower surfaces of willow leaves. 



E. serotinae Beut. Highland Park, M. T. Cook. Common gall on 

 wild cherry. 



E. ulmi Garman. Elizabeth, Westfield. Galls on upper surface 

 of leaves of Ulmus americana. 



E. viburni Steb. Elizabeth. Galls on leaves of Viburnum den- 

 tatum. 



E. ferruginea Farlow. Beech mite-gall. On Fagus americana. New 

 Brunswick. T. J. Headlee. 



E. phlocopotes. Forms galls on plum. Trenton, October 15, 1913. 

 New Jersey Experiment Station Report, 1913. 



A New Genus of Canestriniidae (Acari.). 



By NATHAN BANKS, East Falls Church, Virginia. 



Dr. Roland Thaxter has recently sent me what is to me the 

 most remarkable mite. It will form a new genus in the Canes- 

 triniidae ; mites that are usually found on beetles ; they are 

 genuine parasites, but do little harm to their hosts. 



Acrotocarus n. gen. 



A canestriniid ; body in front with a T-shaped process, the 

 front part of which bears a large, bilobed, hyaline membrane. 

 Legs short, coxae radiately arranged; mouth parts sunken 

 within an oral cavity under the anterior edge of the body. 



Type The following new species. 



Acrotocarus mirabilis n. sp. 



Body dark, legs pale, dorsum with two large pale spots in the middle 

 and a fainter one in front of them, near tip four small pale spots form 

 a transverse row. Main part of body about as long as broad, pointed 

 behind. 



Legs short, fourth pair about as long as width of body, penultimate 

 joints of all, except first pair, with a very long bristle, other joints 

 with one or two short bristles and several at tip of tarsus, caroncles 

 of hind legs smaller than of anterior legs. 



