X40 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 106 



few setules. Dorsal seta on palpal tibia strong and arching with 

 few setules on its outer curvature; lateral seta on tibia nude; 

 ventral seta with relatively few setules. Palpal claw strong, 

 curved, usually with five prongs, occasionally four. Galeal seta 

 strong, usually with one or two long, strong setules ; occasionally 

 nude. Cheliceral base heavy, blade strong and curved; dorsal 

 subapical tooth small but distinct, ventral tooth larger. Rather 

 small punctae on cheliceral base, palpal coxa, and palpal femur. 



Legs : Leg I with two typical genualae and microgenuala, two 

 typical tibialae and a microtibiala, a middorsal spur, a distal 

 microspur, a subterminala, a parasubterminala, and a pretarsala. 

 Leg II with one genuala and two tibialae, a tarsal spur, a proxi- 

 mal microspur, and a pretarsala. Leg III with a genuala and a 

 tibiala, relatively short. Most nonspecialized setae on the free 

 segments of leg I with numerous, rather short, fine, curved set- 

 ules ; on leg II the dorsal nonspecialized setae tend to have fewer, 

 straighter setules; both types on leg III. Leg segments strong; 

 legs without marked taper. All segments with punctae. 



Scutum: Similar in general outlines and proportions to that 

 of E. oregonensis. Anterior margin straight or slightly concave 

 between the extended anterolateral corners and the small con- 

 vexity just anterior to the anteromedian seta. Lateral margins 

 concave, diverging posteriorly. Posterolateral corners extended. 

 Posterior margin convex posterior to the pseudostigmata and 

 slightly concave between them. Setae well clothed with moderate 

 setules; anterolaterals and anteromedian setae about the same 

 length, about half the length of the long posterolaterals. Pseudo- 

 stigmata moderately separated ; posterior to a line drawn between 

 the posterolaterals. Sensillae clavate, widest about two-thirds 

 the length from the base; heads tend to be slightly pointed, 

 covered with rather long, smooth setules on the anterior surface 

 and shorter, more off standing setules on the posterior surface; 

 pedicels distinct. Distinct inverted U-shaped ridge anterior to 

 each pseudostigma, lateral leg extending to posterior margin. 

 Surface with punctae, more numerous within the area inclosed 

 by the crescentic ridges. One or two larger pits near the postero- 

 lateral terminus of each ridge. 



Standard data for the three specimens studied from Kavalli 

 County, Mont. : 



AW PW AP SB ASB PSB AL AM PL S 



71 96 27 33 35 13 44 44 90 38 x 16 (paratype) 



63 90 29 27 32 14 43 43 64 38 



65 87 25 34 30 12 45 41 71 



