THE SPIDER CRABS OF AMERICA 323 



LIBINIA RHOMBOroEA Streets 



Plates 116 and 117; plate 245, figs. 1-3 



Cangrejo Peludo Parra, Descripcion de diferentes piezas de Historia Natural, 



Havana, 1787, p. 134, pi. 50, fig. 1. 

 Libinia rhomboidea Streets, Proc. Acad. Nat. Sci. Philadelphia, 1870, p. 



106 (type-locality. East Indies; holotype in Mus. Phila. Acad. Nat. 



Sci.). — A. Milne Edwards, Crust. Reg. Mex., 1878, p. 131. 

 Libinia inflata Streets, Proc. Acad. Nat. Sci. Philadelphia, 1870, p. 106 



(type-locality, West Indies; type thought to be in Mus. Phila. Acad. Nat. 



Sci., where it is labeled "Cuba")- 

 Libinia distincta von Martens, Arch. f. Naturg., vol. 38, part 1, 1872, p. 



79, pi. 4, figs. 1 a and 1 b. — Gundlach and Torralbas, Anales Acad. 



Cien. Habana, vol. 36, 1899 (1900), p. 303, text-figs, on p. 304; reprint, 



1917, p. 13, pi. [3], fig. 6. Not L. distincta Guerin, 1856. 

 Libinia dubia A. Milne Edwards (part). Crust. Reg. Mex., 1878, p. 129 



(Cuban specimen only), pi. 26. 



Diagnosis. — -Carapace with 6 median spines. Four dorsal spines 

 on branchial region; one dorsal spine on hepatic region. 



Description. — Carapace the shape of L. dubia, pyriform-orbicular. 

 Rostrum more deepl}^ emarginate, horns more acutely pointed. Six 

 median spines, 2 gastric, 1 genital, 2 cai'diac, and 1 intestinal. The 

 anterior gastric spine is one of a transverse row of 5 of which the 2 

 spines of the intermediate pair are smaller and a little more advanced 

 than the others. Five strong lateral marginal spines which with a 

 similar spine at the middle of the hepatic region make almost a 

 semicircle. Four dorsal branchial spines form an elongate rhomb. 

 Two strong pterygostomian spines and, almost in the same line but 

 directed forward, a spine on the edge of the epimeron and in front 

 of the cheliped. . The spines of the branchial and hepatic regions 

 are longer than those of the median region. A short spine at antero- 

 external angle of buccal cavity, and adjacent to it, a longer one 

 on the suborbital region. Basal antennal segment armed with 3 

 short spines, 1 at the antero-external angle, 1 on the inner margin, 

 bordering the antennular fossa, and the third on the outer margin, 

 forming part of the orbital border. 



Chelipeds of old male shorter than in emarginata or duhia; merus 

 armed with a spine above near the proximal end; palm and wrist 

 roughly granulate; dactylus two-thirds as long as upper margin of 

 palm. 



Ambulatory legs longer and more slender than in emarginata or 

 dubia, the first leg longer than the cheliped. Dactyli very long and 

 slender, and almost bare, the hair}^ coating extending only a short 

 distance from the propodus. 



Variations. — In two specimens the genital spine is almost sup- 

 pressed, and the posterior of the cardiac spines is represented by a 

 low elevation with a deep depression at the center, as described by 



