124 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



legs (as well as the carapace) are nearly naked, only the margins of 

 the last two joints (proximal end of the propodus excepted) bordered 

 with short hau's \nth a few longer ones intermingled. The carpus 

 has two prominent lines of granules on the upper surface, the posterior 

 of which is continued somewhat obHquely on the next joint near its 

 margin. 



SESARMA (SESARMA) JARVISI, new species. 



Plate 7. 



Type-locality. — Jamaica: Mount Diablo, St. Ann's; 1 male. 



Type.— Ca,t. No. 24941, U."S.N.M. 



Dimensions. — Type male, length of carapace 10.7 mm., greatest 

 width 12.7 mm., anterior width 10.7 mm., width of front 5.2 mm. 



Carapace narrowed anteriorly, considerably flattened; regions 

 and suprafrontal lobes well marked, outer pair of lobes very narrow. 

 Surface ii-regularly punctate and sparmgly covered wdth tubercles, 

 each of which bears the stumps of a tuft of hair. The obHque ridges 

 usually found on the branchial regions are few and are broken into 

 short irregular Hnes. Lateral tooth blunt. 



The front diminishes in width below, the lower margin is convex in 

 front view and bilobed in dorsal view. 



CheHpeds not much enlarged. The outer surface of arm and wrist 

 are finely rugulose, margins of arm finely granulate or denticulate 

 and not prominent. The chelae are elongate (the specimen is perhaps 

 not full gi-own) ; manus rough with a few scabrous granules outside, 

 upper margin a sharp crenulated ridge. Fingers iiTegularly toothed 

 within, nearly meeting; upper surface of dactylus finely spinulous, 

 almost to the tip. 



Legs very slender, surface rough, sparingly hairy, spine of merus 

 acuminate. Third leg about two and one-half times as long as cara- 

 pace, its merus a little over three times as long as wide. 



SESARMA (HOLOMETOPUS) TAMPICENSE, new species. 

 Plate 8. 



Type-locality. — Tampico, Mexico; Dr. Edward Palmer; June 1, 

 1910. "Lives in the soft mud of the river banks" ; 4 males. 



Type.— C&t. No. 45794, U.S.N.M. 



Dimensions. — Type male, length 16.1 mm., greatest width (at base 

 of second leg) 17.3 mm., width between outer angles of orbit 17.2 mm., 

 width of front 9.4 mm., height of front measured from middle lobes 

 2 mm., extreme length of propodus of cheliped 13.7 mm., height of 

 palm 8.4 mm., length of propodal finger along prehensile edge 6 mm., 

 length of dactylus along upper margm 8.5 mm., length of propodus 

 of third leg 11.8 mm., greatest width of same 4.2 mm. 



