THE GEAPSOID CRABS OF AMERICA. 85 



falcate ; second and third legs with an overlying fringe of long hair 

 along distal end of carpus and continued along upper edge of pos- 

 terior surface of propodus; lower margin of carpus of first three 

 pairs short-hairy. 



First sternal segment very large, anterior margin concave at mid- 

 dle and with a large V-shaped emargination each side behind inser- 

 tion of maxilliped; anterior edge of fifth sternal segment on a 

 much lower level than fourth segment, being somewhat cristiform; 

 next segment similar but in lesser degree; adjacent margins of coxae 

 of first and second legs cristiform. 



Description of female (48571}. Carapace much wider than long, 

 oblong with corners rounded, front and orbits wholly invisible in 

 dorsal view, anterior margin as seen from above bilobed by a broad 

 median gastric depression; on anterior half of carapace five pits 

 each side of middle, four of which form a square, obliquely placed, 

 the fifth pit a little outside the outermost pit of the square. Orbits 

 oval, longer than eyes. 



Chelipeds weaker than in male, propodus sinuous below, palm of 

 subequal height throughout, thumb slightly deflexed. Merus of 

 first three legs fringed with long hair on upper margin, this fringe 

 continued on inner surface of carpus of first pair. 



Legs less stout than in male, dactyli similar. 



Variation. A smaller female from Montego Bay has the front 

 between the eyes, but not the orbits, visible in dorsal view so that 

 anterior margin is not bilobed by median depression. Carapace 

 widened a little anteriorly, legs slightly wider. 



Color. Entire surface of male above and below covered with 

 dark pigment spots arranged with tolerable symmetry on the cara- 

 pace ; a few spots on anterior surface of eye-stalks. 



Measurements. Male holotype, length of carapace 3, width of 

 same 3.3 mm.; female (48571), length of carapace 8.7, width of same 

 11.8 mm. 



'Habitat. Female commensal in Strombus, male free-swimming at 

 surface. 



Range. Cuba ; Jamaica ; Porto Rico. 



Material examined. 



Cuba, on reef flat between Cayo Hutia and Little Cayo, northeast 

 of light; 1914; Henderson and Bartsch, Tomas Barrera Exped. ; 1 

 female (48571). 



Jamaica: From mantle cavity of small Stronibus towed in Mon- 

 tego Bay; Aug. 2, 1910; E. A. Andrews; 1 female (49214). King- 

 ston; surface, by electric light; 1884; W. Nye, jr., Str. Albatross; 

 1 male (49213). 



Porto Rico; 1907; P. Serre coll.; 1 male holotype (Paris Mus.). 



