262 BULLETIN 97^ UNITED STATES NATIONAL MUSEUM. 



Diagnosis. — Antero-lateral teeth prominent. A postero-lateral 

 tooth. Front strongly bilobed. 



Description. — Carapace somewhat hexagonal; margins and sur- 

 face granulate ; three short transverse elevations on either side of the 

 gastric region; mesogastric and cardiac regions prominent. Front 

 with each lobe curved upward, sides (inner border of orbit) oblique. 

 Orbit with a superior notch; outer tooth acute with convex outer 

 margin. Next tooth on the side smaller, less curved; second tooth 

 still smaller, and short-pointed; third tooth most prominent, acumi- 

 nate, a single curved line of granules runs inward from it. On the 

 postero-lateral margin is a low, blunt, obtuse-angled tooth. 



Chelipeds granulate. Inner surface of carpus flattened, obtuse- 

 angled. Propodus of adult male a little higher than its superior 

 length, flattened above; a longitudinal ridge above the lower mar- 

 gin. Dactylus one and one-fourth times as long as upper margin of 

 palm; pollex slightly deflexed. Fingers with a narrow gape; teeth 

 small and low. 



Third pair of legs the longest. Merus joints of all the feet with 

 subparallel sides, and a subterminal tooth on the anterior border. 

 Last three joints of last pair fringed with hair; propodus and base 

 of dactylus of first and second pairs fringed posteriorly. 



Measurements. — Male holotype, length of carapace 37, width of 

 same 44.5 mm. 



Range. — From Eio de Janeiro, Brazil, southward to Patagonia. 

 Ihence northward on the Pacific coast to Peru. 



Material examined. — 



Rio de Janeiro, Brazil; Capt. Harrington; 1 male, holotype of 

 C. cirripes (6125, M. C. Z.) ; received from Peabody Acad. Sci., Nov., 

 1885. 



Montevideo, Uruguay; 1897; Bisege, collector; from Mus. S. 

 Paulo; 1 female (48318). 



Eio de la Plata; Capt. Page, collector; 2 males identified by W. 

 Stinipson (24G9). 



Rio Negro, Patagonia ; U. S. Exploring Exped. ; 2 males, 2 females 

 (1 male is holotype) (234G). 



San Lorenzo Island, Peru; Dr. H. E. Ames, U. S. Navy; 5 males, 

 1 female (18G24). 



CYRTOGRAPSUS ALTIMANUS Rathbnn. 



Plate GO. 



Cyrfograpsus altimanns Rathkun, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 

 121, pi. 4 (type-locality, San Matias Bay, Patagonia; holotype male, 

 Cat. No. C12G, M. C. Z.). 

 Diagnosis. — Antero-lateral teeth not prominent. No postero- 

 lateral tooth. Front faintly bilobed. 



