188 U.S. NATIONAL MUSEUM BULLETIN 292 



of ridge not reaching anterolateral angle of mouth area. Third maxil- 

 lipeds with oblique hairy ridge on merus, gaping \videly, exposing 

 mandibles. Chelipeds subequal, carpus denticulate on flexor margin; 

 palm with low crenulate dorsal ridge extending over entire length; 

 fingers narrowly spoon tipped, extensor surface of movable finger 

 bearing sharp tubercles. Walking legs moderately long and flattened, 

 merus of third pereiopod slightly more than one-third as wide as long, 

 with small acute subdistal tooth on extensor margin; dactyl slightly 

 but distinctly longer than extensor margin of propodus. Denuded first 

 pleopod of male terminating in posterior view in subrectangular end- 

 piece directed distally and slightly laterally (fig. 62o) . A medium-sized 

 species, maximum carapace length in midline about 25 mm. 



Habitat. — In or near upper reaches of freshwater streams, under 

 stones or in very shallow burrows. 



Distribution. — Known only from Jamaica, usually at altitudes of 

 more than 1,000 feet. 



75. Sesarma (Sesarma) curacaoense De Man 



Figures 61, 62p 



Sesarma curacaoensis De Man, 1892, p. 257, pi. 10: figs. 6-6b [type-locality: 



Curagao]. 

 Sesarma (Sesarma) curacaoense. — Rathbun, 1918, p. 293, pi. 78: figs. 1-2; pi. 160: 



fig. 3. 



Diagnosis. — Carapace subrectangular, about four-fifths as long in 

 midline as wide, moderately convex especially anteriorly and laterally, 

 rather indistinctly striate laterally, smooth with patches of scurflike 

 pubescence elsewhere; lateral margins distinctly concave, widest at 

 level of very broadly acute tooth posterior to outer orbital angle, 

 fronto-orbital distance slightly less than maximum width of carapace; 

 front curving ventraUy gradually and rather regularly, not abruptly 

 deflexed, less than three-fifths as wide as carapace, margin with broad 

 shallow median sinus in dorsal view, postfrontal lobes nearly oblit- 

 erated. Eyes well developed, cornea about as wide as eyestalk. True 

 ventral margin of orbit largely replaced by hairy granulate, faintly 

 sinuous ridge accentuated posteriorly by deep, well-defined groove, 

 mesial end of ridge curving posteriorly rather obscurely toward 

 anterolateral angle of mouth area. Third maxillipeds with oblique 

 hairy ridge on merus, gaping widely, exposing mandibles. Chelipeds 

 subequal, carpus produced into shallow, minutely denticulate lobe 

 on flexor margin; palm with rather prominent crenulate dorsal ridge 

 extending over entire length; fingers very narrowly and acutely 

 spoon tipped, movable finger with row of five to nine horny tubercles 

 on extensor margin. Walking legs rather broad and flattened, merus 

 of third pereiopod fully two-fifths as Avide as long, with sharp sub- 



