446 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



All six segments of the abdomen are distinct. The sixth or terminal 

 segment is very convex. There is a depressed line at tlie ])ase. The 

 posterior margin is rounded. The uropoda extend some distance 

 beyond the extremity of the terminal abdominal segment. The inner 

 distal angle of the peduncle reaches the extremity of the terminal 

 abdominal segment. The branches are about equal in length, each 

 being li mm. long, and extend ahiiost their entire length beyond the 

 terminal segment of the abdomen. The inner branch is wider than 

 the outer branch and rounded posteriorly, while the outer branch is 

 acutely pointed. Both branches in the normal position lie folded 

 under the abdomen. 



The seven pairs of legs are prehensile. There is a low rounded 

 carina on the basis of the last four pairs. 



Only one specimen, a female, was collected at Panama by Dr. W. L. 

 Jones in 1885. The type is in the University of Pennsylvania. 



