THE GEAPSOID CRABS OF AMERICA. 299 



Chelipeds strong, upper and outer margins denticulate, with a 

 deep subterminal sinus; inner margin expanded at the middle, den- 

 tate ; outer surface of merus and carpus crossed by granulated rugae ; 

 inner angle of wrist acute. Hand nearly twice as high as its su- 

 perior width; densely but obscurely granulate outside, a short lon- 

 gitudinal ridge near the middle, upper margin acute, granulate, the 

 granules in pairs in a single line ; inner surface irregularly dentate, 

 pollex broad and flat, upper surface of dactylus with 14—16 spinules, 

 which reach nearlj'^ to the tip. 



Legs very broad and nearly naked; third leg a little over twice 

 as long as the carapace, its merus less than twice as long as broad. 

 Margins of last two joints tomentose. 



Measurements. — Male (22839), length of carapace 26.4, width be- 

 tween orbital angles 30, width of front 18 mm. 



Range. — From Trinidad. West Indies, to Desterro, Brazil. 



Remarks. — S. rectum is nearest S. sulcatum, a species with a lat- 

 eral tooth, and narrower and more hairj' legs. 



Material examined. — 



Trinidad; Jan. 30-Feb. 2, 1884; Albatross; 1 male, 1 female 

 (19476). 



Surinam; Dr. Hering; 1 male holotype (Mus. Phila. Acad. Sci.). 



Pernambuco, Brazil: 1876-1877; R. Rathbun; 1 male young 

 (40817). Aug. 1, 1899; on mangroves; Branner-Agassiz Exped. ; 



1 male, 1 female (25711). 



Mapelle. Bay of Bahia, Brazil; 1876-1877; R. Rathbun; 1 female 

 (40819). 



Plataforma, Bahia, Brazil; 1876-1877; R. Rathbun; 1 male 

 (40820). 



Salt Lagoa, Caravellas, Bahia, Brazil ; 1876-1877 ; R. Rathbun ; 1 

 female (40818). 



Terra de Masahe, Rio de Janeiro, Brazil; Jan., 1912; E. Garbe; 



2 males (47862). 



Rio de Janeiro, Brazil; Thayer Exped.; 1 male (22839). 



Ilha Casquerinita, Santos, Brazil; June, 1913; H. Luderwaldt; 1 

 male, 1 female (47867). 



Piassaguera, Santos, Brazil; June, 1913: H. Luderwaldt; 2 males 

 (47859). 



Iguape, Sao Paulo, Brazil; 1902; R. Krone; 1 male (47827). 



SESARMA (HOLOMETOPUS) OCCmENTALE Smith. 



Sesarma occidentalis Smith, Trans. Connecticut Acad. Arts nnd Sci., vol. 

 2, 1870, p. 158 (type-loc;ility, Aca.iutla, west coast of Central America; 

 male holotype in P. M. T. U.). 



Diagnosis.— TrATiSYerse. Front without deep median sinus. Hand 

 cristate above. 



