o08 B ULJ J>'/r IX i)", rNITED STAT?:S NATIONAL MLTSEUM. 



Side margins of juale abdomen sinnous. Appendages of tirht 

 segment widened behind the tips. 



Allied to S. clnereum and S. miersii. It differs from both in the 

 front having parallel sides instead of widening below, in the fingers 

 gaping, in the male appendages transversely, instead of obliquely, 

 cut at the tip. From S. cinereum it differs also in its narrower 

 carapace, without scattered tufts of hair, longer fingers, and narrower 

 male abdomen; from S. 'miersii in the relatively smooth palms, those 

 of mi&j'sii being coarsely granulate. 



Measvrements. — Male holotype, length of carapace 16.1, greatest 

 width of same (at base of second leg) 17.3, width between outer 

 angles of orbit 17.2, width of front 9.4 mm. 



Hahitat. — Lives in the soft mud of the river banks. 



Range. — KnoAvn only from the type-locality. 



Material examined. — Tampico, Mexico; June 1, 1910: Edward 

 P;i.lmer: 4 males, 1 of which is holotype (45794). 



SESARMA (HOLOMRTOPUS) RICORDI Milne Edwards. 



BEACH CRAB. 



Piute 89. 



Sesarma rlcordi Milne Edwards. Ann. Sci. Nat., ser. P>, Zrtol., vol. "iO, 18.0.S. 



p. 18.S [149], (type-locality, Haiti; type in Paris Mus.). 

 Sesarma (juerini Milne Edwards, Ann. Sci. Nat., ser. 3, Zool., vol. 20, 1853, 



p. 183 [149], (" patrie inconnue"; type in Paris Mus.). 

 Sesarma miniata Saussure, M6m. Soc. Pliys. Hist. Nat. Geu&ve, vol. 14, 



1858, p. 442 [26], (type-locality, Saint-Thomas; cotypes in Geneva and 



Paris Museums). 

 Sesarma angnstipes Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859. 



p. 66 (in part, at least). Not /S. anf/ustipes Dana, 18.5,2. — Smith. Trans. 



Connecticut Acad. Arts and Sci., vol. 2, 1870. i). 1.51). — de Man. Notes 



Leyden Mus., vol. 14, 1892, p. 253, pi. 10, fig. 5. 

 Sesaryna sfimi)s(nili Miers, Proc. Zool. Soc. London, 1881, p. 70, (type- 

 locality, Florida and the Tortugas; type in Brit. Mus.). Not /S. stivip- 



so7iii ]Miers, 1886. 

 Sesarme cinerea IIeilimu.x, Proc. Ac;id. Nat. Sci. Philadelphia. 1888. p. 320. 



Not Sesarma cinerea (Bosc). 

 Sesarma cinerea Ives, Proc. Acad. Nat. Sci. Philadelphia, 1891, p. 181. 

 Sesarma (Ilolomctopus) ricorcli Katiibun, Proc. Biol. Soc. Washingtim, 



vol. 11. 1897. p. 91. 



Diagnosis. — Carapace and chelipeds little rough. Third leg twice 

 as long as carapace, merus three times as long as wide. 



DescHftion. — Carapace a little wider behind than in front, the 

 length about equal to the anterior width. Surface finely punctate, 

 but granulate only behind the orbits and sparingly on the supra- 

 frontal lobes, and coarselv so on the deflexed surface of the front. 



