2o8 STALK-EYED CRUSTACEA 



wanting or faintly indicated. Cervical sutures straight. 

 The fourth joint of the external maxillipedes with 

 outer margin convex, forming a single curve to the 

 insertion of the fifth joint. Exognath reduced to a 

 stump. 



Range. — Guiana. I found specimens in the damp 

 forest on the Calabash Creek behind Plantation Everton, 

 Berbice. 



3. Pseudothelphusa fossor. 



PseudotJicIpJiusa fossor . . M. J. Rathbun. 



The superior margin of the front not keeled, tuber- 

 culate, bilobate, with a median suture. The fourth joint 

 of the external m.axillipedes has its outer margin convex, 

 forming a single curve to the insertion of the fifth joint. 

 Exognath reduced to a stump. Carapace finely gran- 

 ulate. 



These crabs are of a light colour, and are found under 

 stones. 



Range. — Venezuela, West Indies. 



4. Pseudothelphusa xantusi. 



PscudotJielpliusa xantiisl . . M. J. Rathbun. 



Carapace granulate to the naked eye. Superior 

 margin of front not keeled, tuberculate, with the inferior 

 margin sinuous or straight. The fourth joint of the 

 external maxillipedes has its outer margin convex, 

 forming a single curve to the insertion of the fifth joint. 

 Exognath not reduced to a stump. Walking legs not 

 slender. 



Range. — Costa Rica, United States of Colombia, 

 Venezuela. 



