Superfamily Argiopoidea 



spiders; the genera occurring in the United States can be separated 

 as follows: 



TABLE OF GENERA OF THE MISUMENINyE 



A. First and second pairs of legs devoid of spines except 

 beneath the tibiae and metatarsi, or with one or two 

 minute ones elsewhere. P. 525. Misumena 



AA. First and second pairs of legs with distinct spines in ad- 

 dition to those beneath the tibiae and metatarsi. 

 B. Abdomen high and pointed behind. P. 524. Tmarus 

 BB. Abdomen broadly rounded behind. 



C. Cephalothorax very flat. P. 531. Coriarachne 



CC. Cephalothorax moderately high. 



D. Abdomen, cephalothorax, and legs pale whitish or 

 yellowish, but little marked except bands on legs 

 of male. P. 529. Misumessus 



DD. Abdomen or cephalothorax and legs dark or heavily 

 marked with dark. 

 E. Median ocular area longer than wide; tibiae of the 

 first and second pairs of legs with only two 

 pairs of spines beneath; some of the setae clavate. 

 P. 530. Oxyptila 



EE. Median ocular area as wide as or wider than long; 

 tibiae of the first and second pairs of legs with 

 more than two pairs of inferior spines; setae some- 

 times blunt but never clavate. 

 F. Tarsal claws of the first two pairs of legs with 

 only five or six teeth. P. 532. Xysticus 

 FF. Tarsal claws of the first two pairs of legs with 

 more than six teeth. P. 540. Synema 



Genus TMARUS (Tma'rus) 



The members of this genus are easily distinguished from 

 other crab-spiders occurring in our fauna by the fact that the ab- 

 domen is high and pointed behind (Fig. 572). The lateral eyes 

 of each side are on two distinct tubercles, of which the posterior 

 is the larger. 



These spiders live on plants and can run with great rapidity. 

 Their colours are more or less protective. When one of these 



524 



