524 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



depth, 2.2 mm. Male, Caracas: Length, 22.7 mm.; width, 35.2 mm. 

 Female, Caracas: Length, 49 mm.; width, 78 mm. 



Type. — No. 5101, Mus. Comj). Zool. ; one immature female. Trinidad; 

 S. Garmau, April G, 1879. 



Additional localities. — Venezuela: Near Caracas (Copenhagen Mus.; 

 one small male, one small female, one young). Caracas; G-ollmer (Nos. 

 1387, 1388, 2122, Berlin Mus.; one male and three females). A large 

 female labeled "Antilles, Dr. Claudius, 1858," is in the museum at 

 Kiel. 



This crab is very closely related to P. denfata. of the Windward 

 Islands and P. fossor also of Venezuela. It is easily distinguished 

 from either by its lower, wider front, from dentata by the tubercle on 

 the manus and the wider merus of the endognath, and from fossor by 

 its rougher, flatter carapace and projecting frontal margin. 



PSEUDOTHELPHUSA AFFINIS, new species. 



Potamocarcimis dentatus Ortmann, Zool. Jahrb., Syst., 1897, X, p. 318 (part). 

 Not P sen doth elphnsa dentata (Latveille). 



Allied to P. deutata; carapace ivider; front wider and lower; cervical 

 sutures convex to each other in their anterior half. 



This species differs from P. dentata, as follows: The carapace is 

 wider; the cervical suture, although nearly straight, is slightly convex 

 forward in its anterior half; median suture and epigastric lobes very 

 faintly indicated. Lateral margins, although distinctly denticulate, are 

 uot broken by an epibranchial or other large tooth. Front wider and 

 much less high than in P. deutata, the height between the tubercles 

 being about one-twelfth the greatest width of the front, measured inside 

 the tubercles of the lateral margin. The lower margin of the palm is 

 very convex, the width of the palm being nearly equal to the superior 

 length. , 



dimensions. — Female: Length, 22.4 mm. ; width, 38.8 mm.; superior 

 width of front, 10.7 mm. ; entire heiglit of front, 1.3 mm, ; superior length 

 of palm, 13.5 mm. ; width of same, 12.5 mm. ; length of dactylus, 16.5 mm. 



Type. — No. 128, Mus. Phila. Acad. Nat. Sci.; one female, dried. 

 Cuba; Guerin; Dr. T. B. Wilson collection. 



PSEUDOTHELPHUSA MAXILLIPES, new species. 



Superior margin of front keeled; maxillipeds unusually ivide ; exognath 

 about three fourths the length of the ischium of the endognath. 



Cara])ace of medium width, obscurely granulate on the frontal and 

 lateral regions, finely punctate. Cervical suture shallow, nearly 

 straight. Lateral margin denticulate, interrupted by a small tootii at 

 the cervical suture. Front (fig. 15, a) of slight depth and vertically 

 concave; lower edge strongly marginate, more depressed in the center 

 than outwardly; the two halves slightly sinuous; upper margin tuber- 

 culate, the lobes nearly straight and transverse in a dorsal view and 



