320 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Diagnosis. Carapace very narrow behind. Legs very wide. 



Description. Carapace narrowing rapidly from before backward, 

 about as long as the posterior width. Areolation much as in Sesarm-a. 

 the mesogastric and cardiac regions well marked, lateral regions ob- 

 liquely striated, surface densely punctate, anteriorly rough with short 

 rows of granules. 



Front about two-thirds as wide as the carapace and more than four 

 times as wide as high, nearly vertical, widening below : upper edge 

 nearly straight, median fissure deep and narrow, inner lobes narrower 

 than outer lobes and separated from them by shallow emarginations; 

 surface granulate: lower edge convex and lightly sinuous. 



Outer angle of orbit blunt and short. No lateral tooth. 



Outer surface of ehelipeds coarsely roughened except the fingers. 

 A triangular expansion of the distal half of the inner margin of the 

 arm is cut into jagged teeth on its distal margin. Upper edge of 

 palm subacute and finely granulate but not in a single line. Mobile 

 finger very rough above, for two-thirds its length. Prehensile edges 

 of fingers irregularly toothed, narrowly gaping, short-hairy at base. 



Legs broad and flat ; third pair less than twice as long as carapace, 

 its merus twice as long as wide. Margins of last three segments 

 hairy; the propodus is wider and more hairy in the first leg than in 

 the other legs. 



Measurements. Male (19408). length of carapace 17.5, anterior 

 width of carapace 20.7, posterior width of same 16.7, width of front 

 13.5 mm. 



Range. From Greytown, Nicaragua, to the Rio de la Plata. 



Remarks. This species has a suspicious resemblance to Sesanna 

 trapezium Dana 1 said to inhabit the Hawaiian Islands, but not since 

 found there. 



Material examined. 



Greytown, Nicaragua; Feb. 8 and 12, 1892; Chas. W. Richmond; 1 

 male, 8 females (19420). 



Santana, Paparo, Venezuela; H. Pittier; 1 male (46103). 



Trinidad; Jan. 30-Feb. 2, 1884; shore: Albatross; 1 female 

 (19421). 



Cayenne, French Guiana; 2 males, 1 female (Paris Mus.). 



S. Joao de Barra, Rio de Janeiro, Brazil; Dec.. 1911; E. Garbe; 

 2 males. 1 female (47853). 



Rio de Janeiro, Brazil (1331, Berlin Mus.). 



Estasao Cubatoa, Santos, Brazil; December, 1895; Bisego, col 

 lector; 2 males, 1 female (47856). 



Ilha Casquerinita, Santos, Brazil; June, 1913; H. Luderwaldt; 1 

 male, 1 female (47866). 



1 U. S. Expl. Exped., vol. 13, Cnist, pt. 1, 1852, p. 354 ; atlas, 1856, pi. 22, flg. 8 



