90 Rathbun Synopsis of the American Sesarmse. 



D'. Upper surface rugose. 



E. Hand very broad. Htilr<ilu Smith. 



E'. Hand elongate. cntfixiperf Cano. 



A'. Carapace without a tooth behind the outer orbital tooth. 

 B. Man us with two or more pectinated ridges on the upper surface. 



Subgenus Parasesarma 1 de Man. 



W. Man us without two or more pectinated ridges on the upper surface. 

 Subgenus Holometopus Milne Edwards = subgenus 



Sesanna de Man. 

 C. Sides of carapace converging rapidly posteriorly. 



rubripes Rathbun, new name millleri Miers.* 2 

 C'. Sides of carapace not converging rapidly posteriorly. 



D. Protogastric or supra-frontal lobes tuberculate or granulate. 

 E. Movable finger extraordinarily enlarged along its proximal 



half. benedicti Rathbun, new name = recta de Man. 3 



E'. Movable finger not extraordinarily enlarged along its prox 

 imal half. 

 F. Outer surface of hand densely hairy at base of fingers. 



barbimana f Cano. 



F'. Outer surface of hand not densely hairy at base of fingers. 

 G. Meri of ambulatory legs less than twice as long as 

 broad. 



recta* Randall mullerii* A. Milne Edwards. 

 G'. Meri of ambulatory legs more than twice as long as 



broad. 



H. Front widening considerably toward the lower margin. 



* miersii* Rathbun, new name = " angustipes ? " Miers,* 



1881 = stimpsonii Miers, 1886,* not 1881. 



H/. Front not widening considerably toward the lower 



margin. 



J. Protogastric or supra-frontal lobes faintly granulate. 



cinerea Bosc. 

 J'. Protogastric or supra-frontal lobes rough with ruga? 



or lines of granulations. 

 K. Front not more than 3i times as wide as high. 



occidental-is * Smith. 



K'. Front more than 3 times as wide as high. 

 L. Margins of meri of ambulatory legs subparallel 

 for their distal half. 



roberti* Milne Edwards = americana* 



Pocock bromeliarum* Rathbun. 



*Not represented in America. 



2 Challenger Report, Zool. XVII, 270, pi. xxi, f. 3, 1886, Bahia, 



3 Notes Leyden Mus., XIV, 249, pi. X, f. 4, 1892, Surinam. 



4 This species has not been sufficiently characterized and is described 

 below. 



*Type examined by the writer. 

 f Not seen by the writer. 



