Superfamily Argiopoidea 



eyes are widely separated and nearly straight. The median 

 eyes of each row are farther apart than they are from the lateral 

 eyes. The clypeus is at least twice as wide as the anterior eyes. 

 The fore spinnerets are longer than the hind ones and stout. 

 The following is the only known species. 



Cesonia bilincata 

 — This is a very 

 species on account 

 The 

 inch 



(C. bi-lin-e-a'ta). 



easily recognized 



of its markings. 



female measures about one fourth 



in length. The body is white with 



Fig. 3og. 

 CESONIA BILINEATA 



two broad, black, longitudinal stripes ex- 

 tending nearly the whole length of the 

 cephalothorax and abdomen above (Fig. 

 309), and with a black stripe near each 

 lateral margin of the lower side of the 

 abdomen. The legs are gray with white 

 hairs. The spinnerets are long. 



The species is widely distributed 

 throughout the Atlantic region. It 

 flat egg-sac, which it loosely fastens to 



was 



makes a snowy-white 



the lower side of a stone. A female with her 



taken in this situation at Ithaca, N. Y., in August. 



egg-sac 



Genus GNAPHOSA (Gna-pho'sa) 



This and the following genus differ from all other members 

 of the family found in our fauna in having the lower margin of 

 the furrow of the che- 

 liceras armed with a 

 broad keel or lobe (Fig. 

 310). This genus can 

 be distinguished by the 

 fact that the posterior 

 series of eyes is much 



wider than ' the anterior Fi ° ^ chelicer.e of gxaphosa 



series and is strongly recurved. The posterior lateral eyes are 

 not much larger than the posterior median eyes. 



The two following species are our most common representa- 

 tives. 



Gnaphosa gigantea (G. gi-gan'te-a).-- This is a robust species 



320 



