UNITED STATES. 63 



It is, however, very possible that our species may 

 be a variety of punctatus. 



Genus CHELIFER. Geoff, Leach. 



Palpi hrachiform, didactyle ; thorax with the first 

 segment dtvided by a transverse indented line; eyes 

 two ; mandibles short. 



Species. — 1. C. *mwricatus. Third joint of the 

 palpi nearly three times as long as the second, linear, 

 gradually a little attenuated to the base ; thorax mu- 

 ricated. 



Inhabits North America. 



Cabinet of the Academy. 



Body ovate, narrowed before, rounded behind ; 

 thorax black brown opake, gradually narrowed from 

 the base to the tip of the mandibles, armed with nu- 

 merous short, robust spines ; feet rufo- testaceous ; 

 palpi rufous, basal joints subglobular, gibbous be- 

 hind, third joint cylindrical, nearly three times 

 longer than the second, armed with short rigid hairs, 

 and gradually attenuated to the base, fourth joint 

 shorter but somewhat larger than the preceding one, 

 and gradually much attenuated to its base ; hand 

 black-brown, above oblong- suboyate, laterally linear, 

 fingers as long as he hand, paler, incurved and fur- 

 nished with a few elongated, flexible hairs ; abdo- 

 men above black brown, and with the feet furnished 

 with minute, spinelike hairs, segments margined with 

 obsolete pale testaceous. 



Length rather more than l-10th of an inch. 



