1818.1 OF THE UNITED STATES. 447 



on their edges^ and an anterior one hardly distinct from 

 the posterior elevated supereanthus of the eye, superior 

 eye lid with two obsolete fissures, anterior supereanthus 

 destitute of a prominent angle; clypeus divided in the 

 middle by a fissure, lateral segments regularly and bo- 

 tusely arcuated at the edge; labrum prominent, undu- 

 lated; cheeks 2ia6. sides of the thorax densely granulated, 

 a conic tooth beneath the anterior tooth of the edge of 

 the thorax; anterior feet equal, olivaceous-green, imma- 

 culate, beneath fulvous or yellowish; carpus with a pro- 

 minent obtuse spine within, beneath which there is no 

 angle; hands rounded above and beneath, fingers deflect- 

 ed, white or yellowish, obtusely and somewhat regularly 

 dentated within, thumb often purplish above at base; ab-^ 

 domen, second segment of the male abruptly .much nar- 

 rower than the first and third, third much wider than the 

 fourth, penultimate one with equal transverse diameters 

 and not wider at tip than the terminal segment, which is 

 widest near the middle in consequence of being much 

 arcuated at base. 



Length about one inch and one fifth, breadth one 

 inch and a third. 



Not uncommon in muddy places of our southern 

 coast. It resembles C. Panope, but is sufficiently dis- 

 tinct by the more convex thorax, colour of the fingers, 

 and form of the segments of the clypeus, which in Panope 

 are slightly undulated; in Panope also the carpus has a 

 projecting angle beneath the spine, whioh is wanting in 

 this species; a striking difference is observable in the se- 

 cond abdominal segment, which is deeply emarginate at 

 the posterior angles, and not narrower at base than the 

 first segment. 



