1919] Chamberlm: Western Spiders 247 



Zelotes tuobus sp. nov. 



Female — Carapace black, in part of a dull chestnut cast. Sternum 

 dense black. Legs black, of slightly brownish cast, excepting the tarsi, 

 which are paler. Endites blackish, paler across distal end. Abdomen 

 black or nearly so, a little paler, greyish black, beneath. Anterior row 

 of eyes strongly procurved, the median eyes lying above the line con- 

 necting the centers of the laterals; laterals fully twice the diameter of 

 the medians; the medians about their diameter apart, but very close 

 to the laterals. Posterior row of eyes straight; median eyes a little 

 smaller than the laterals, about three-fourths their diameter apart, 

 a little farther from the laterals. Quadrangle of median eyes obviously 

 longer than wide, slightly wider behind than in front. Tibise I and II 

 unarmed beneath. Metatarsi I and II armed beneath at base with 

 one pair of spines. Posterior tibiae not armed above. Epigynum as 

 shown in Plate XVI, Fig. 7. 



Length, 9.5 mm. Length of cephalothorax, 3.9 mm. Length of 

 tib. -f pat. I, 3.6 mm.; of tib. + pat. IV, 4.2 mm. 



Type— M. C. Z. 387. Utah: Fillmore. 



This species is very close to Z. ater (Hentz). The epigynum 

 is proportionately longer with the anterior pockets obviously 

 closer together and the inner lateral elevated edges also less 

 widely separated. 



PHOLCID.^. 



Psilochorus utahensis sp. nov. 



Cephalothorax pale yellow. Legs darker yellow. Abdomen grey, 

 with some darker mottling. Posterior row of eyes straight; median eyes 

 nearly once and a half their diameter apart, contiguous with lateral 

 eyes, about their radius from anterior laterals and three-fourths their 

 diameter from anterior medians. Characterized by having femur I 

 in the female shorter than femur IV, the reverse of the condition in the 

 male. Process of chelicera in male large, arising at base and projecting 

 prominently forward and downward, at tip acutely pointed and cundng 

 mesoventrad, (Plate XVII, Fig. 1). The species is characterized par- 

 ticularly by the details of structure of the male palpus. In this the femur 

 is slender from base to a little beyond middle, with the distal end 

 strongly enlarged; at base on ectal side an elongate tubercle or swelling 

 and a small process or tubercle from ventral edge at distal end. The 

 exterior process of the pal]Dal organ straight, narrowest at middle, and 

 differing from that of puhdlus and calij'ornm in appearing bifid at distal 

 end. (PlateXVII, Fig. 2). 



Length of female, to 4.4 mm. Length of tib. + pat. L, 4.75 mm. ; of 

 tib. -f pat. IV, 5 mm. 



Type— M. C. Z. 451. Utah: Clear Lake; Fillmore; Fill- 

 more Canyon; Pine Canyon; et cetera. 



