8 Wisconsin Academy of Sciences, Arts and Letters. 



gle of eyes \ wider than long; middle anterior eyes touching; 

 eyes of second row a little nearer the lateral than the dorsal eyes, 



Cyeba. 



50. Coxae I separated by width of labium; legs ( 5 ) 1, 3, 2, 4; ( g ) 4, 3, 



1, 2; quadrangle of eyes less than one third wider than long; mid- 

 dle anterior eyes S*abtouchiag; eyes of second row halfway be- 

 tween lateral and dorsal eyes Cyt^a. 



51. First row of eyes straight ' 85 



52. First row of eyes curved 59 



53. Middle eyes of first row touching 55 



54. Middle eyes of first row not quite touching 57 



55. Metatarsi III and IV with spines only in terminal circles; quad- 



rangle of eyes equally wide in front and behind; eyes of second 

 row half way between lateral and dorsal eyes Epiblemum. 



56. Metatarsi III and IV spined throughout their length; quadrangle 



of eyes Mdder behind; eyes of second row nearer the lateral than 

 the dorsal eyes Attus E. S. 



57. Lateral eyes of first row nearly touching middle eyes; eyes of sec- 



ond row nearer lateral than dorsal eyes; legs (5)1, 4, 2,3;(5') 



4, 1, 3, 2 PSEUDICIUS.' 



58. Lateral eyes of first row separated by i their own diameter from 



middle eyes; eyes of second row not nearer lateral than dorsal 

 eyes; legs ( 5 ) 1, 3, 4, 2; ( j> ) 4, 3, 1, 2 Hasarius. 



59. Dorsal eyes nearer to each other than to lateral borders Mjevia. 



60. Dorsal eyes further from each other than from lateral borders. ... 61 



61. Quadrangle equally wide in front and behind; legs 4, 3, 2, 1 



Attus W,^ 



62. Quadrangle wider behind; legs not 4, 3, 2, 1 Dendryphantes. 



The following tables are useful only for spiders described in this paper. 



They are designed to furnish an easy method for determining species. To 

 use them, determine the relative length of the legs of the spider in ques- 

 tion and find the corresponding formula in the tables. This will usually 

 place the spider in a group of four or five genera, rendering it a compara- 

 tively easy matter to determine the genus. When the difference between 

 two legs is extremely slight they are placed together with a dash above. 

 The tables do not include the genera Synemosyna, Synageles, Salticus and 

 Lyssomanes; Dendi^phantes multicolor also does not appear since our only 

 specimen has but thx-ee legs. 



1 It requires pi'actice to distinguish a straight from a slightly curved row of eyes, but 

 since these genera are only represented by three species the difficulty -nill be inconsider- 

 able. E. scenicum is a dark spider with two oblique white bands on each side of the abdo- 

 men; A. palustris has two white spots near the center of the dorsum of the abdomen; 

 A. imperiaUs has four snowy white oblique bands on the face and f alces and a ring of white 

 on the distal end of the femur of the palpus. 

 ^ Our only species of this genus is from west of the Rocky Mountains. • 



5 The species which we leave in Attus Walck. It being only represented by an immature 

 specimen we do not determine its genus. 



