212 STALK-EYED CRUSTACEA 



6. Pseudothelphusa gracilipes. 



Boscia gracilipes ... A. Milne Edwards. 



The outer margin of the fourth joint of external 

 maxillipedes is convex, and gradually curving into the 

 anterior margin. The walking legs are very slender. 

 The lower margin of the sixth joint of the larger hand 

 of the female is most convex or protuberant below the 

 articulation of the movable finger. Width of carapace 

 more than one and three-fourth times its length. 



Guatemala. 



7. Pseudothelphusa jouyi. 



The lower margin of the front faintly rimmed. The 

 outer margin of the fourth joint of external maxillipedes 

 convex and gradually curving into the anterior margin. 

 The walking legs are not slender. No marginal teeth 

 on carapace. 



Mexico, in Lake Chapala, 5000 feet elevation ; Falls of 

 Rio San Juan. 



8. Pseudothelphusa agrestis. 



The lower margin of the front is strongly rimmed, 

 being sinuous or trilobed in a front view. The outer 

 margin of the fourth joint of external maxillipedes 

 convex, and gradually curving into the anterior margin. 

 The walking legs are not slender. The external ap- 

 pendage of the maxillipede reaches about half the length 

 of the second joint. 



Costa Rica. 



