DECAPOD CRUSTACEANS OF THE WEST INDIES 167 



Genus Pachygrapsus 

 60. Pachygrapsus corrugatus (Von Martens) 



Grapsus (Leptograpsus) corrugatus Von Martens, 1872, p. 107, pi. 4: figs. 8, 8b 



[type-locality: Cuba]. 

 Pachygrapsus corrugatus. — Kingsley, 1880, p. 200. 



Diagnosis. — Carapace siibrectangular, somewhat more than four- 

 fifths as long in midhne as ^\dde, rather strongly convex longitudinally 

 and transversely, prominently striate everywhere, at least five striations 

 extending entirely across carapace; lateral margins subparallel, con- 

 verging slightly anteriorly, without tooth posterior to outer orbital 

 angle, fronto-orbital distance only shghtly less than maximum width 

 of carapace; front moderately depressed, not sharply deflexed at 

 postfrontal lobes, about half as wide as carapace, margin nearly 

 straight in dorsal view. Eyes well developed, cornea about as wide as 

 eyestalk. Ventral margin of orbit produced, bluntly denticulate, 

 curving abruptly to anterolateral angle of mouth area. Third maxil- 

 lipeds mthout oblique hairy ridge, mdely gaping, exposing mandibles. 

 Chehpeds subequal, carpus armed with strong sharp curved spine on 

 flexor margin; palm sharply tuberculate dorsally; fingers broadly 

 rounded, prominently spoon tipped, extensor margin of movable 

 finger bearing few sharp spines. Walking legs broad and flattened, 

 merus of third pereiopod fully half as wide as long, wiih. sharp sub- 

 distal tooth on extensor margin; dactyl more than foiu"-fifths as long 

 as extensor margin of propodus. A small species, maximum carapace 

 length in midline about 13 mm. 



Habitat. — The only specimen of this species available to us is a 

 female found on "coastal rocks" at Saint Croix. 



Distribution. — Salt Cay (New Providence I.), Cuba, Puerto 

 Rico, Saint CroLx. 



61. Pachygrapsus gracilis (De Saussure) 



Figures 51, 52j 



Metopograpsus gracilis De Saussure, 1858, p. 443, pi. 2: fig. 15 [type-locality: 

 Saint Thomas]. 



Grapsus guadalupensis Desbonne in Schramm, 1867, p. 48 [type-locality: Guade- 

 loupe]. 



Pachygrapsus gracilis. — Stimpson, 1871, p. 113. — Rathbun, 1918, p. 249, pi. 60: 

 fig. 3; pi. 61: fig. 1.— Monod, 1956, p. 419, figs. 569, 571, 574-577.— Holthuis, 

 1959, p. 239, pi. 10: fig. 3.— HartnoU, 1965, pp. 114, 115, 116, 117, 136, 137, 

 141, 144, 145, 146, fig. 13d. 



Diagnosis. — Carapace trapezoidal, about three-fourths as long in 

 midline as \vide, rather strongly convex longitudinally and trans- 

 versely, distinctly striate on branchial regions, faintly so on gastric 



