290 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Chelipeds of male very heavy. Outer surface of arm and wrist 

 crossed by short rugose lines, outer surface of chela almost smooth. 

 Upper margin of arm with a blunt subterminal tooth, lower surface 

 bounded on three sides by short, thick spines. Palm nearly twice as 

 high as its superior length, its upper margin acute, crenulate, dis- 

 tally projecting in a tooth, inner surface sparsely tuberculate. Pol- 

 lex and adjacent portion of palm flattened. Fingers moderately 

 gaping, each with two of its prehensile teeth enlarged. Upper sur- 

 face of dactylus armed with about eleven blunt spinules. Chelipeds 

 of female rather small. 



Legs very broad; third pair two and one-third times length of 

 carapace, its merus two and one-third times as long as wide. Merus 

 joints each with a strong subterminal spine above. Legs, especially 



last three joints, with rows of hair thickest 

 on margins of last two joints. 



Terminal segment of male abdomen as 

 long as broad. 



Measurements. Male (4631), length of 

 carapace 33.3 mm., width of same 41.2 mm. 

 Range. From La Paz, Lower Califor- 

 nia, Mexico, to Panama. 

 Material examined. 

 La Paz, Lower California; L. Belding; 

 1 male (4631). 

 San Bias, Tepic, Mexico ; June 14, 1897 : 



FIG. 145. SESARMA (SESARMA) _ T , .. 7 _, f 7 ' ' 3 



SULCATUM, ABDOMEN OF MALI -Nelson and Goldman ; 2 males, 2 females 

 (4631), x n. (20653). 



Corinto, Nicaragua; J. A. McNeil; 1 female holotype (M. C. Z.). 

 Boca del Rio Jesus Maria, Costa Rica ; Apr., 1905 ; P. Biolley and 

 J. F. Tristan; 1 male (32315). 



La Capitana, Canal Zone; H. Pittier; 2 males (45532, 45569). 



SESARMA (SESARMA) RETICULATUM (Say). 



Plate 77. 

 Ocypode reticulatus SAY, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, 1817, 



p. 73, pi. 4, fig. 6 (type-locality, "muddy salt marshes" [east coast of 



United States] ; type not extant). 

 Ocypode (Sesarma) reticulatus SAY, Journ. Acad. Nat. Sci. Philadelphia, 



vol. 1, 1818, p. 442. 

 Sesarma cinerea WHITE (part), List Crust. Brit. Mus., 1847, p. 38, not 



S. cinereum (Bosc). Specimen presented by Thomas Say, perhaps 



cotype. 

 Sesarma reticulata GIBBES, Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, p. 180. 



Diagnosis. Very convex. Sides sinuous, tooth blunt. Front 

 wide. Legs thickly tomentose. 



Description. Carapace about four-fifths as long as broad, convex 

 fore and aft, sides concave behind the small, obtuse, lateral tooth, 



