1905.] NATURAL SCIENCES OF PHILADELPHIA. 329 



Femur of palpus cylindrical and straight, patella about half as long 

 as femur and slight!}' enlarged distally, tibia short with a long curved 

 apophysis. The side of the tarsus opposed to the apophysis raised 

 into a ridge armed with a series of about ten short strong spines. The 

 female is und escribed. 



9 Length 1.25 mm. Cephalothorax, long .53 mm., wide .41 mm. 



Legs I II III IV Palpus 



Tar 26 .24 .22 .24 .17 



Met 24 .24 .22 .29 



Tib 31 .26 .22 .38 .12 



Pat 16 .14 .14 .14 .07 



Fem 41 .38 .34 .43 .14 



Cephalothorax not elevated as in the male. Posterior eyes in a 

 straight line, median eyes smaller than the lateral, separated from each 

 other by their diameter and from the lateral eyes by a narrower interval ; 

 anterior eyes in a procurved line, the median eyes two-thirds as large 

 as the lateral, separated from each other by their radius and from the 

 lateral by one-fourth their diameter. Epigynum consists of a smooth 

 convex plate covering the openings when viewed from below. Several 

 males and females were captured together on the under side of stones 

 on an exposed hillside, on a sunny winter day, bank of Fall creek, one 

 mile east of Forest Home, near Ithaca. New York. 



ACARTAUCHEUIUS. 



Acartaucheuius columbiensis n. sp. (PI. XXVIII. fig. 11; PI. XXIX, fig. 9.) 



cJ* Jjength al)out 1.7 mm. Cephalothorax, long .74 mm., wide .55 mm. 



Legs I II III IV Palpus 



Tar 34 .34 .29 .31 .22 



Met 46 .46 .38 .53 



Tib 5 .5 .38 .6 .26 



Pat 19 .19 .18 .17 .19 



Fem 6 .62 .48 .67 .31 



Cephalothorax squarely and broadly truncate in front, gently in- 

 clined until just back of the eyes where it is abruptly elevated, brown- 

 ish-yellow, clothed in the eye region with light colored hairs directed 

 upward and backward. Posterior eyes in a slightly procurved line, 

 equal, the median eyes separated from each other by a little less than 

 their diameter, and from the lateral by a little less than twice as much ; 

 anterior eyes in a straight line, the median eyes much smaller than the 

 lateral and very close to each other while separated from the lateral by 

 about three times their diameter. Median ocular area much longer 

 than wide. Clypeus very much wider than the ocular area, plane and 

 strongly retreating. 



