ART. 30 NEW PAEASITIC MITES EWING 3 



Remarks. — The genus Haemogamasus Berlese is here restricted to 

 species in which the sternal plate of tlie female is provided with 

 many setae and the fixed arm of the chelicera is without recurved, 

 fanglike setae. 



HAEMOGAMASUS STERNALIS, new species 



Plate 1, Figure 2 



Body about twice as long as broad and somewhat pointed at both 

 ends, thickly beset with fine, slightly curved, subequal setae. Epi- 

 stome of medium size, branches straight and sharp pointed. Cheli- 

 cerae moderate, fixed chela slightly surpassing movable one and bear- 

 ing an inflated seta near its tip. Sternal plate broader than long, 

 posterior margin festooned, and bearing about 20 setae, including a 

 pair of stout ones at the anterior corners. Genitoventral plate fully 

 three times as long as broad, lateral margins concave, and bearing 

 several setae. Anal plate broadly rounded in front and angulate 

 behind; anus situated centrally; paired anal setae situated at the 

 level of the anterior margin of anus; unpaired anal seta, subequal 

 to paired ones, situated one half the distance from the posterior rim 

 of the anus to the apex of anal plate. Legs slender; anterior and 

 posterior pairs subequal and longer than the other pairs; all coxae 

 without spines. Length of female, 0.92 mm; width, 0.52 mm. 



Type host. — Blarina hrevicavda talpoides. 



Type locality. — Adirondack Lodge, Essex County, N.Y. 



Type {holotype) slide.— U.S. '^.M. no. 1067. 



Remarlcs. — Described from a single female specimen taken by Fran- 

 cis Harper, August 12, 1925, from the caudal region of the short- 

 tailed shrew at the type locality. This species is most nearl}^ related 

 to Haeinoganiasus alaskensis Ewing, 1925. It differs from H. alas- 

 kensis in having the sternal plate poorly sclerotized and festooned 

 behind and in having the sternal setae arranged in irregular trans- 

 verse rows. 



EUHAEMOGAMASUS, new genus 



Body thickly clothed with short setae. Fixed arm of chelicerae 

 not provided with recurved, fanglike setae. Ventral plates of fe- 

 male as follows : Sternal plate short, usually broader than long, 

 and provided with two or three pairs of setae; genitoventral plate 

 expanded and broadly rounded posteriorly, never reaching anal 

 plate; anal plate longer than broad, broadly rounded in front, and 

 with three setae. Legs rather slender; coxae without spines. 



Type species. — Euhaemogamasus onychomydis, new species. 



Remarks. — This genus is most nearly related to Eaemogammus 

 Berlese but is separated from it in having only a few sternal setae 

 (four or six) arranged in pairs. In addition to the type, two other 

 new species are included in it. 



