Superfamily Argiopoidea 



BB. Abdomen globose. P. 357. Latrodectus 



AA. Lateral eyes of each side contiguous or nearly so. 



B. Posterior median eyes fully three times the diameter 

 of one of them apart. P. 340. Spintharus 



BB. Posterior median eyes rarely more than twice the diam- 

 eter of one of them apart. 

 C. Anterior median eyes larger than the posterior median 

 eyes, and much wider apart. 

 D. Abdomen pointed behind. P. 342. Euryopis 



DD. Abdomen more globose, broadly rounded behind. 

 P. 356. Dipcena 



CC. Anterior median eyes rarely larger than the posterior 

 median eyes, when they are larger they are not wider 

 apart than the posterior median eyes. 

 D. Cephalothorax with a transverse furrow in the mid- 

 dle; abdomen usually prolonged either above or 

 behind the spinnerets. 

 E. Abdomen very long and slender, vermiform. 



P. 336. Ariamnes 



EE. Abdomen much shorter, p. 338. Argyrodes 



DD. Cephalothorax without transverse furrow; abdomen 

 not greatly prolonged. 

 E. Sternum pointed or rounded behind; the hind 

 coxae either contiguous or more or less widely 

 separated by the end of the sternum. 

 F. Anterior median eyes much larger than the 

 anterior lateral eyes. P. 360. Steatoda 



FF. Anterior median eyes not much if any larger 

 than the anterior lateral eyes. 

 G. Lateral eyes of each side slightly but dis- 

 tinctly separate. 

 H.. Clvpeus not wider than the area occupied 

 by the eyes. P. 362. Lithyphantes 

 HH. Clypeus much wider than the area occupied 

 by the eyes. P. 362. Asagena 



GG. Lateral eyes of each side contiguous. 



II. Lobes of the stridulating organ of the 

 abdomen very long; a small spider 

 measuring less than one tenth inch in 

 length. P. 361. Coleosoma 



334 



