STALK-EYED CRUSTACEA 207 



b. Superior frontal margin bilobate. — {P.fossoi-?} 



C. External appendage of external maxillipedes not 

 reduced to a stump. 



c. Inferior margin of front straight or sinuous. — (/\ 

 xantusi}) 



III. Front sloping downwards, with a strong superior 

 frontal border. 



D. External appendage of external maxillipedes re- 

 duced to a stump. — {P. ganiiani.) 



E. External appendage of external maxillipedes about 

 one-third the length of the third joint.— (/^. doitata.) 



F. External appendage of external maxillipedes about 

 two-thirds the length of the third joint. — {P. rcficxifrons.) 



1. Pseudothelphusa americana. 



PscudotJiclphusa auiericana . Saussure, M. J. Rathbun. 

 PseudothclpJmsa dugesi . . M. J. Rathbun. 



The lower margin of the front is strongly rimmed, 

 convex. The lateral teeth of the carapace present, though 

 indistinct. The outer margin of the fourth joint of the 

 external maxillipedes is convex, and gradually curving 

 into the anterior margin. Walking legs are not slender. 

 The inner lobe of the abdominal appendage of the first 

 segment in the male is not falcate. 



Range. — Hayti, Mexico, Cuba. 



2. Pseudothelphusa denticulata. 



PseudotJielpJmsa denticidata . M. J. Rathbun. 

 Boscia dentiadata II. Milne Edwards. 



Carapace finely granulate. Superior margin of front 

 not keeled, tuberculate, unilobate, with median suture 



