STALK-EYED CRUSTACEA 211 



the spines on the terminal joint about five or six in a 

 row. The cervical sutures arch towards each other. 

 Ecuador. 



3. Pseudothelphusa plana. 



PsaidotJiclpJmsa plana . . . S. J. Smith. 



The outer margin of fourth joint of external maxilli- 

 pedes straight or, concave forming an angle with the 

 anterior margin, its width being one and a half times 

 the length. The cervical sutures are sinuous. The 

 walking legs are of moderate width, with the spines 

 on their terminal joint about five or six in a row. 



Peru. 



4. Pseudothelphusa lindigiana. 



The outer margin of fourth joint of external maxilli- 

 pedes straight or concave, forming an angle with the 

 anterior margin ; this joint is very little wider than long. 

 The cervical sutures are sinuous. The walking legs are 

 of moderate width, with the spines on their terminal joint 

 about five or six in a row. 



United States of Colombia, Ecuador. 



5. Pseudothelphusa exilipes. 



The outer margin of fourth joint of the external 

 maxilHpedes is convex, and gradually curving into the 

 anterior margin. The walking legs are very slender. 

 The lower margin of sixth joint of the larger hand of 

 the female most convex or protuberant at the middle 

 of the palm. The width of the carapace is less than one 

 and three-fourth times its length. 



Costa Rica, 



