264 PROCEEDINGS OF THE ACADEMY OF [March, 



forms wliich do not form holes; weak cheUcera and short lal:)ium asso- 

 ciated with slender legs; large eye area is found in the diurnal species, 

 while small eye area is associated with tubicolous forms and species 

 with very short legs. So the genera here defined are based upon both 

 morphological and ethological characters. 



Finally, this paper is by no means a comprehensive monograph, 

 but is intended to be a help to the one who comes later with sufficient 

 material at his disposal to make the monograph. 



Family LYCOSID^. 



Trochanters deeply emarginated below at their distal ends. Legs 

 usually in the order IV, I, II, III. Inferior tarsal claw usually without 

 teeth. Eyes homogeneous, usually unequal and in three rows, the 

 eyes of the first generally smaller than the others. Palpal tibia of cJ^ 

 without apophyses. 



Family PISAURIDiE. 



With the characters of the Lycosidce, except that the palpal tibia of 

 the o' has apophyses, that the inferior tarsal claws are usually toothed, 

 that legs I, II and IV usually differ but little in length, and that the 

 four posterior eyes are more nearly in a line. 



Key to the North American Genera of Lycosid.e. 



a. 1. — Tibia I with 5 ventral pairs of spines, eyes of the first row sub- 

 contiguous SOSILAUS. 



a. 2. — Tibia I Avith 1-4 ventral pairs of spines, eyes of the first row not 

 subcontiguous. 

 h. 1. — Metatarsus IV in both sexes longer than the patella and 

 tibia combined, eyes of the second row at least 1.5 times 

 their diameter apart, sides of the head nearly or quite 

 vertical, chelicera weak and nearly straight in front, 

 dorsal eye area quite or almost one-quarter the length 



of the cephalothorax, Pardosa. 



h. 2. — Without such a combination of characters. 



c. 1. — Posterior spinnerets fully 1.5 times as long as the an- 

 terior, chelicera weak with the anterior border nearly 

 straight. 

 (1. 1. — Posterior margin of the chelicoi-a with 4 teeth, 



Sosippus. 



d. 2. — Posterior margin of the chelicera with 2 or 3 teeth. 



e. 1. — First eye row quite or almost as broad as the 



second, labium longer than broad, sides of 



head not vertical in the 9 , . . Pirata. 



