THE COMMON SPIDERS 



larger than P. atra and smaller than Gnaphosa conspersa. The 

 cephalothorax is proportionally longer and narrower and the 

 sternum narrower and less round than in P. atra (fig. 18). 

 The cephalothorax is dull black at the sides, with a whitish 



stripe in the middle. The legs are also 

 dull black and, like the cephalothorax, turn 

 brown in alcohol. The abdomen is black, 

 with a bright white stripe in the middle 

 that extends from the front end about two- 

 thirds its length; and at the hinder end, just 

 over the spinnerets, is another white mark 

 (fig. 17). The under side of the abdomen 

 is dark at the sides and light in the middle. 

 The eyes and maxillae are as in P. atra, the 

 maxillae a little less rounded at the ends. 



Drassus saccatus. — Four-fifths of an inch 

 long, and pale, without markings. The 

 head is shorter and wider than in Gnaphosa 

 conspersa and Prosthesima atra, and the 

 eyes cover a larger part of the head. Both 

 rows of eyes (figs. 2, 19) are curved, with 

 the middle highest. The middle upper 

 pair are oval and turned apart toward the 

 front. The lateral eyes are twice their 

 diameter from the middle pair. The max- 

 Fig. 19. Drassus saccatus. illae (fig. i) are widened at the ends on both 



— Female enlarged three . , —., i -i • • • • • i 



times. For eyes and sides. 1 he labium is as wide as it is long, 

 mouth parts see figs, i narrowe d toward the end but truncated at 



and 2 in Introduction. 



the tip. The color is light gray, with short 

 fine hairs all over the body. The front of the head, the feet, 

 and the mandibles and maxillae are darker and browner. The 

 abdomen is marked only with the usual four muscular spots 

 and sometimes a few transverse dark markings toward the 



