Superfamily Argiopoidea 



are nearly equal in size, the anterior median eyes being slightly 

 smaller than the anterior lateral, and the posterior lateral eyes, 

 which are much larger than the anterior eyes. Also, when 

 viewed from in front only six eyes are visible, the four anterior 

 eyes, and the posterior median eyes, occupying the ends of the 



Fig. 621. SELEXOPS AISSUS 



front row; these eyes are much smaller than the four anterior 

 eyes. The tibiae of the lour legs bear on the lower surface three 

 pairs of spines, and the metatarsi two pairs. 



The spiders of this genus are found under the bark of trees, 

 under stones, and in other similar situations; the depressed form 

 of the body enables them to enter thin spaces, or to conceal 

 themselves in slight depressions when lying in wait for their prey; 

 and they run with astonishing rapidity. 



Family HETEROPODID^E (Het-er-o-pod'i-dae) 



The Giant Crab-spiders 



There occur within the limits of our fauna a small number 

 of large spiders, which on account of their size and the fact that 

 they resemble thomisids in the form of the body and the attitude 

 of the legs may be termed giant crab-spiders. 



These are really tropical or subtropical spiders whose range 

 extends into the southern part of our territory. One of them, 



55' 



