THE GRAPSOID CRABS OF AMERICA. 273 



fathoms; fne. S. brk. Sh.; Sta. 3577; 2 specimens (19348). Mar. 24, 

 1894; 3 fathoms; R. oyster Sh.; Sta. 3589; 1 male, 2 females (19340). 

 Mar. 31, 189G; 5 fathoms; M. Sh.; Sta. 3616; 2 females (20167). 

 Mar. 31, 1896; 4 fathoms; M. Sh.; Sta. 3619; 2 males (201G8). 



Lat. 32° 32' N.; long. 117° 07' W.; Monument 258, Mexican 

 Boundary Survey; July 18, 1894; Dr. E. A. Mearns, U. S. Army; 4 

 males (18663). 



San Bartolome Bay, Lower California; Apr. 11, 1889; Albatross; 

 Imale (17454). 



Todos Santos Bay, Lower California; H. Hemphill; 2 males 

 (19199). 



Puerto Refugio, Angel Island, Gulf of California; Mar. 29, 1889; 

 Albatross; 1 male (17453). 



San Luis Gonzales Bay, Gulf of California; Mar. 27, 1889; Alba- 

 tross; 504" specimens (17452). 



Guaymas Bay, Sonora, Mexico; shore; Feb. 20, 1904; Wm. Palmer; 

 2 females (31511). 



Inner harbor, Guaymas, Mexico ; Feb. 23, 1891 ; P. L. Jouy ; 35+ 

 specimens (17292, 17293). 



Locality unknown; 1 y. (17685); and 1 male, U. S. Exploring 

 Exped. (2444). 



TETRAGRAPSUS, new genus. 



Type. — T. jouyi (Rathbun). 



Carapace quadrate, with the side margins parallel, dentate. Front 

 more than half width of carapace, curved gradually downward, and 

 not projecting beyond the antennules or epistome. Orbit outwardly 

 very incomplete ; eye slightly elongate. Suborbital ridge prominent, 

 tuberculate. Maxillipeds gaping, merus longitudinally grooved, 

 longer than wide, and as long as, but wider than, the ischium. 



The maxillipeds resemble those of Hemigrapsus in form and sur- 

 face but are not approximate. In the shape of carapace, chelipeds 

 and legs and in the character of the suborbital ridge this genus ap- 

 proaches Brachynotus de Haan,^ but in the latter the front is lami- 

 nate, the maxillipeds smooth, their merus short and broad. 



TETRAGRAPSUS JOUYI (Rathbnn). 



Plate 71. 



Brachynotus {Heterograpsus) jouy I Rathbun, Proc. U. S. Nat. Mus., vol. 

 16, 1893, p. 247 (type-locality, Guaymas, Mexico; type, Cat. No. 17496, 

 U.S.N.M.). 

 Diagnosis. — Sides parallel, dentate. Front rounding down to an- 

 tennular cavities. Maxillipeds gaping; merus elongate, grooved. 



1 Fauna Japon., Crust., 1833, p. 5 ; 1835, p. 34. 

 65863—17 18 



