4 PROCEEDINGS OF THE NATIONAL. MUSEUM vol. 82 



EUHAEMOGAMASUS ONYCHOMYDIS, new species 



Pl^vte 1, Figure 3 



Vestiture typical of the genus. Chelicerae large and powerful, the 

 fixed chela in the case of the female longer than the movable one, not 

 inflated, but strongly curved at the tip and provided with four or 

 five dull teeth. Epistome large, broad at the base, fringed with 

 sharp processes, most of which are curved and some of which are 

 branched. Sternal plate broader than long, front margin incurved, 

 its six subequal, curved setae arranged in two divergent rows; 

 genitoventral plate much dilated and evenly rounded posteriorly, 

 bearing many short, subequal setae and an anterior, submarginal 

 pair much larger than the others ; anal plate small, the longest anal 

 diameter being over a third the length of the plate; paired anal 

 setae situated opposite the middle of the anus. Legs moderate; 

 second pair decidedly the stoutest; last pair the slenderest. Length 

 of female, 0.93 mm; width, 0.61 mm. 



Type host. — Onychotnys sp. 



Tyjye locality. — Oraibi, Ariz. 



Type {holotype) s//f/e.— U.S.N.M. no. 1068. 



Remarks. — Described from type specimen (a female) taken from 

 type host, a grasshopper mouse, which was collected at the type 

 locality June 4, 1927, by Paul E. Trapier. The specimen came 

 through the United States Biological Survey. This species differs 

 from the other two of the same genus, described in this paper, in 

 the size and shape of the sternal plate and also of the genitoventral 

 plate. 



EUHAEMOGAMASUS UTAHENSIS, new species 

 Plate 1, FiGtiRB 4 



Body rather poorly clothed with setae. Movable chela of chelicera 

 stout, armed with strong teeth, fixed arm modified into a straight, 

 toothless, feelerlike process. Sternal plate greatly reduced in size, 

 over twice as broad as long, front margin indefinite; it bears only 

 the middle pair of sternal setae ; genitoventral plate about three times 

 as long as broad, sides incurved, and bearing about 10 setae; anal 

 plate egg-shaped in outline, anus centrally placed, paired anal setae 

 situated at the level of the anterior margin of the anus. Peritremes 

 extending forAvard to the front coxae. Legs slender; first and last 

 pairs subequal, longer than the others; second pair of legs stoutest. 

 Length of female, 0.88 mm ; width, 0.56 mm. 



Type host. — Neotoma lep'ida lepida. 



Type locality. — Salina, Utah. 



Type (holotype).— U.S.^.M. no. 1069. 



