178 



U.S. NATIONAL MUSEUM BULLETIN 29 2 



lobes sharply produced anteriorly. Eyes well developed but not large, 

 cornea nearly as wide as eyestalk. True ventral margin of orbit dis- 

 tinct only at mesial end, largely replaced by nearly straight hairy 

 granulate ridge accentuated posteriorly by rather deep groove, mesial 

 end of ridge not curving to anterolateral angle of mouth area. Third 

 maxillipeds with oblique hairy ridge on merus, gaping widely, exposing 

 mandibles. Chelipeds subequal, carpus denticulate on flexor margin; 

 palm sharply tuberculate dorsally; fingers pointed, not spoon tipped, 

 movable finger Avith few sharp granules on extensor margin. Walking 

 legs long, slender and flat, merus of third pereiopod little more than 

 one-fourth as \nde as long, with acute subdistal tooth on extensor 

 margin; dactyl slightly shorter than extensor margin of propodus. 

 Denuded first pleopod of male terminating in posterior view in slender 

 distally notched endpiece directed distolaterally (fig. 58/). A medium- 

 sized species, maximum carapace length in midline about 19 mm. 



Habitat. — In rainwater reservoirs at leaf bases of large bromeliads 

 growing at elevations of more than 800 feet. 



Distribution. — Known only from Jamaica. 



Figure 58. — Denuded terminal portions of male right first pleopods: a, Aratus pisonii, 

 specimen shown in figure 54, posterior view; b, Cyclograpsus integer, specimen shown in 

 figure 55, posterior view; c, same, lateral view; d, same, anterior view; e, Metasesarma 

 rubripes, specimen shown in figure 56, posterior view;/, Metopaulias depressus, specimen 

 shown in figure 57, posterior view. 



Genus Sesarma 



68. Sesarma (Holometopus) americanuin De Saussure 



Figures 62a-/ 



Sesarma americana De Saussure, 1858, p. 441 [type-locality: Saint Thomas]. 

 Sesamia (Holometopus) tampicense Rathbun, 1914, p. 124, text-fig. 4, pi. 8 [type- 

 locality: Tampico, Mexico]; 1918, p. 307, text-fig. 151, pi. 88. 



Diagnosis. — Carapace subquadrate, about nine-tenths as long in 

 midline as wide, moderately convex longitudinally and transversely, 



