Superfamily Argiopoidea 



Genus SITTICUS (Sit'ti-cus) 



The lower margin of the furrow of the chelicerae is unarmed 

 except in a Californian species. The cephalothorax is high, con- 

 vex, and rather wide; the abdomen is short and wide. The 

 quadrangle of the eyes is nearly twice as wide as long, and occupies 

 less than two fifths of the length of the cephalothorax. The coxa? 

 of the first legs are widely separated. 



The following is our only well-known species; a second one, 

 6". claremonti, was described by the Peckhams from a single dam- 

 aged specimen taken in California. 



Sitticus palustris (S. pa-lus'tris). — The adult measures from 

 one fifth to one fourth inch in length. The cephalothorax is 

 light brown in the female and dark in the male; there is a narrow 

 white stripe in the middle, and one on each side, as high as the 

 lateral eyes. The abdomen has a wide, white transverse marking, 

 just behind the middle, and several angular marks behind it. On 

 the front half are two white spots. In the male the large middle 

 marking is usually divided into two white spots. This species lives 

 on plants and makes nests among leaves (Emerton); it is distrib- 

 uted from New York to Colorado and from Anticosti to Alberta. 



Genus SALT1CUS (Sal'ti-cus) 



The cephalthorax is much longer 

 than wide, narrow in front and a 

 little wider behind; the thorax is 

 nearly flat in the first half and then 

 slopes abruptly. The anterior eyes 

 are very unequal in size; and the 

 posterior eyes are not prominent. 

 The quadrangle of eyes occupies 

 much less than one half of the 

 length of the cephalothorax. The 

 abdomen is long and narrow and the 

 sides are nearly parallel. 



Four species have been found 

 in our fauna; but three of them are 



known only by a few specimens from the Southwest. 



Salticus senicus (S. sen'i-cus).-- This species is one of the 



commonest members of the Attidse in our fauna (Fig. 748). It is 



676 



Fig. 748. SALTICUS SENICUS 



