No. 461.) NORTH AMERICAN INVERTEBRATES. 319 
ı. Tibia III and IV with a stout spine at base above . 
Tibiz III and IV without spine at base above, although there may A 
one near middle above en 
2. No spines above on tibize U1 sad IV; led bel above on sone NM 
head large and high  . 
A spine r near middle s Sie on bie 1H ai Iv $: 
3. Upper spir ts not longer than lower ; anterior eye-row not videt than 
the second . . Trochosa. 
Upper spindeners we iin Met; anterior ede wider than sec- 
ond row ; tarsi heavily scopulate à . Sosippus. 
4. Cephalic region with a wedge- PON ink; ARE a central stripe ; 
posterior spinnerets longer than others ; eyes of second row scarcely their 
diameter apart, small species ^ ; i i à ; . Pirata. 
No such mark on cephalic region ; spinnerets subequal in length E; 
5. Tibia I with 4—4 imbricated spines, the basal ones reaching beyond 
base of second ones ae very small species; eyes of second row 
not their diameter apart Trabea. 
Basal spines on tibia I not reaching beyond base di the third pair, 
usually but 3-3 spines below 6. 
6. oe without median pui of any ied: ; spines adie tibia I 
very short, 3-3 . Allocosa. 
xeolycos 

eter apart; 3-3 long spines under tibia I, the basal pair usually reaching 
next pair; lip not longer than broad ; smaller spiders . . Pardosa. 
OXYOPIDÆ. 
1. Posterior eye-row only slightly procurved ; mandibles higher than 
height of cephalothorax in front; large greenish spiders . Peucetia. 
Posterior eye-row strongly procurved ; mandibles ac as long as 
height of cephalothorax in front 2. 
2. P. M. E. much closer to P. S. E. ihe to sadi oer : Api. 
P. M. E. about as close to each other as to P. S. E. . . Oxyopes. 
ATTIDJE. 
1. Abdomen more or less constricted ; cephalothorax usually constricted ; 
pedicel distinctly chitinized . er i 2. 
Neither cephalothorax nor abdomen ie: pedicel soft . 4. 
