ART. 30 NEW PARASITIC MITES EWING 1 1 



est ; coxae large, all but those of first pair bearing at least one spine. 

 Length of female, 0.77 mm ; width, 0.46 mm. 



Type Aosi^.— Bat, (?) Myotis sp. 



Type locality. — Adel, Oreg. 



Type slides.— U.S. '^.'M. no. 1076. 



Remarks. — Described from four females mounted on two slides, 

 taken from " common brown bat " at the type locality, August 19, 

 1930, by Eosaline R. Walker (Bishopp no. 1*4849). 



Subfamily Dermanyssinae 



Genus DERMANYSSUS Duges, 1834 



Body stout, integument leathery and capable of much distension. 

 Chelicerae of female very long and needlelike, chelae absent; 

 chelicerae of male modified. Palpi simple, without spines or proc- 

 esses. Dorsal plate of female large, entire, frequently poorly 

 sclerotized. Anal plate broadest near its anterior border, not egg- 

 shaped in outline, with an anterior pair of setae and a posterior 

 unpaired seta; anal opening not circular, situated in posterior part 

 of anal plate. Legs rather slender, second pair never greatly 

 enlarged. 



Type species. — Acarus gaJlinae DeGeer (1778). 



Remarks. — Demnanyssus Duges and Allodermanyssus Ewing, 

 1923, are the only genera in the subfamily Dermanyssinae. Der- 

 manyssus differs from Allodermanyssus in that the dorsal plate of 

 the female is entire and the anal plate is not egg-shaped in outline 

 and has the opening in the posterior part. 



DERMANYSSUS EVOTOMYDIS, new species 



Plate 4, Figure 2 



Body shape and texture of skin typical of the genus. Peritreme 

 extending forward slightly beyond the second coxae. Palpi stout, 

 not surpassing the front femora. Chelicerae very slender, but at the 

 tip of each there is a slight swelling with a few minute teeth laterally. 

 Sternal plate over three times as broad as long, arched. Genito- 

 ventral plate about twice as long as broad, very slightly broadened 

 posteriorly. Anal plate slightly longer than broad, of a shape typical 

 of the genus ; anal opening over twice as long as broad, situated about 

 half its longest diameter from posterior margin of anal plate. Legs 

 rather slender ; first and last pairs subequal and slightly longer than 

 the others. Length of female, 0.86 mm ; width, 0.62 mm. 



Type host. — Evotomys sp. 



Type locality.— Mount Mclntyre, N.Y. 



T7/pe (holotype) sZeV/e.— U.S.N.M. no. 1077. 



