415 Annals of the Carnegie Museum. 



on outer and inner faces with a smooth, longitudinal ridge. Hand 

 with short, inconspicuous and deciduous hairs, which are densest on 

 the fingers, but nowhere beard-like. A few longer setae on the cutting 

 edges of the fingers. Carpopodite short, subcylindrical, with a very 

 indistinct sulcus on the upper side, granulated like the hand, granules 

 largest on inner side, where some of them are subspiniform. Mero- 

 podite subtriangular in cross-section, granules on inner and outer 

 surface obsolete, one or two granules near distal end of upper margin 

 subspiniform, and the lower surface with two rows of small spinules. 

 Ischiopodite of third peraeopods with a strong hook. First pleopods of 

 the Procambarus-type, rather short and straight. Anterior margin 

 with a distinct and prominent shoulder near the tips. Outer and 

 inner part in contact up to close to the tips. Tip of outer part rounded 

 and blunt, with a minute soft spine posteriorly at the extremity. 

 Tip of inner part straight, tapering to a setiform point, which is not 

 jiorny, and is considerably longer than the tip of the outer part. This 

 setiform part bears at its base, on the anterior side, and in front of 

 the shoulder, a short, slightly procurved, horny spine, which has two 

 tips, the larger blunt, the smaller pointed. On the inner side, the 

 inner part of the copulatory organ is flattened, with hairs radiating 

 from an indistinct oblique rib, and is slightly dilated, but only very 

 little wider than the basal part of the organ. 



Male of the second form. — Chelae smaller, hooks of third peraeopods 

 small, and the copulatory organ having in place of the horny spine a 

 small, soft, blunt tubercle, and the tip of the inner part less distinctly 

 setiform. 



Female. — Chelae not so long, hand shorter, rather long-ovate and 

 not subcylindrical, with finer granulations. Annulus ventralis trans- 

 versely subovate, slightly elevated, with the usual curved fissure, 

 which divides the annulus longitudinally into two unsymmetrical 

 parts, the larger part more elevated than the smaller. 



Measurements. — Largest male, first form: Total length, 52; cara- 

 pace, 25; anterior section of carapace, 19; posterior section of carapace, 

 6; abdomen, 27; length of hand, 22; width of hand, 6.5 mm. Largest 

 female: Total length, 44; carapace, 21; anterior section of carapace, 

 16; posterior section of carapace, 5; abdomen, 23; length of hand, 14; 

 width of hand, 5 mm. 



Locality. — Tributaries of Rio de los Indios, Los Indios, Isle of Pines. 

 Carnegie Mus. Cat. Nos. 74.924 (Types), and 74.925 (Cotypes). 



