XXXI, '20] ENTOMOLOGICAL NEWS 289 



Described from several cotypes of the writer's private 

 collection, all from Corvallis. This is the first species of the 

 genus to be described from the North West. 



Gamasus inarmatus new species. (Text fig. 4.) 



9 : Medium sized, yellowish-brown species. Palpi fully one-half as 

 long as the first pair of legs; next to last segment with a rather conspic- 

 uous spine on its inner aspect near the tip; the two segments proximad to 

 this one, each with two smaller and less conspicuous spines on their inner 

 aspects. Chelicerae large and when extended reaching or even surpassing 

 the tips of palpi. Body somewhat pointed behind; sparsely clothed with 

 inconspicuous setae above. Genital plate fully as broad as long with its 

 base at the posterior margins of coxae IV, and apex, which is sharp and 

 spine-like, at the level of the front margins of coxae of third pair of legs. 

 Front legs slightly longer than the body; hind legs reaching slightly be- 

 yond the tip of abdomen, tarsi with prominent, long, spine-like setae. 

 Length, 0.92 mm.; width, 0.50 mm. 



cf : Male considerably smaller than female. Second pair of legs greatly 

 enlarged, but without the tooth-like spurs found in other species of the 

 genus. The setae or spines on all the legs somewhat stronger than in 

 female. Length, 0.82 mm.; width, (about) 0.40 mm. 



From Twin Falls, Idaho; on roots of red clover; by W. 

 N. Birch, county agent. 



Described from two females and one male sent to me by 

 A. C. Burrill who received them from Mr. Birch. The 

 absence of the spurs or chitinous teeth on the second pair 

 of legs distinguishes this species from all others in this coun- 

 try. Cotypes at present in writer's collection. 



Hologamasus quinquedentatus new species. (Text fig. 5.) 



9 : A large chestnut brown gamasid. Epistome very broad, but 

 rather short, thus the chelicerae are not covered when in repose. Along 

 its front margin the epistome bears five, almost equal, sharp cusps or 

 teeth spaced at about equal distances from each other. Chelicerae 

 powerful, fixed chela surpassing the movable one and apparently tooth- 

 less; movable digit provided with a few backwardly directed teeth. 

 Abdomen broadest at the level of the coxae of legs IV, evenly rounded 

 behind, shoulders weak but provided with the usual pair of setae. Body 

 clothed above with small, inconspicuous setae. Epigynum triangular, 

 its base behind the coxae of legs IV. Anterior legs longer than the rest; 

 tarsi with straight, parallel margins, and weak claws which are situated 

 on long, slender and weak pedicels. Second pair of legs enlarged, the 

 trochanter being the stoutest of the segments; tarsi each with a pair of 

 spines situated near the tip but distinctly below the base of pedicel; claws 



