"^"189^''] PROCEEDINGS OF THE NATIONAL MUSEUM. 657 



Fig. 3). Abdomen of female very large, coiicealiiiji the sternum. Oiieli 

 petls loug aud strong, uneciual, pimetate; merus roughened above, 

 inner margin spinous, the si)ines longer and stronger at tlie distal end; 

 inferior margin granulate. Carpus with a very shallow median groove 

 near the center, and a stout spine on the inner margin. Large hand 

 much swollen, deep; there is a short line of tubercles on the inner side 

 of the lower margin near the cari)us; dactyl strongly arched ; fingers 

 and lower surface of hand s])ecklcd witli small dark s})ots, which, on the 

 fingers, are granulous; teeth of prehensile edges irregular, broad, and 

 strong. Smaller hand less broad and deep; fingers in contact or 

 slightly gaping; otherwise as in the larger hand. The chelipeds of the 

 female are shorter and more slender than those of tlie male. The merus 

 joints of the ambulatory legs are slightly compressed; upper and lower 

 margins almost parallel; upper margin obscurely granulate; carpal 

 joints unarmed; propodal joints spinulous on the distal portion; 

 dactyli comiiressed, with five rows of spines. 



Length of $ 57"""; width without spines, 85; approximate length of 

 larger cheliped, 158; length of proi)odus, 90; depth, 37; thickness, 23. 

 Length of 9,(13; width, without spines, 05; ai)proximate length of 

 larger cheliped, 135; length of propodus, 71; depth, 25; thickness, 15. 



Lake Nicaragua, Dr. J. F. Brausford; 4 ,^ , 2 9 (5837), grading in size 

 from two inches to three-fourths of an inch in length. 



Near Greytowu, Nicaragua, Dr. Louis F. II. Birt; 2^,39 (1378S) all 

 large. Greytowu is at the mouth of the river San Juan, an outlet of 

 Lake Nicaragua. 



liio Frio, Costa llica, a tributary of the San Juan, Charles W. IMch- 

 mond, March 3, 18U2; one 9 (17057). 



EPILOBOCERA Stiiupsoii. 



In 1800 Stimpson instituted tlie genus EpUohoccra (Ann. Lye. Nat. 

 Hist. N. Y., VII, !>. 234) for a fresh-water crab of the family Thelphii- 

 sidie, distinguished by the frontal process meeting the internal subor- 

 bital lobe, behind which the antenna passes to the orbital cavity. The 

 merus of the external maxilliped is transverse, its anterior margin 

 rounded, and the palpus gouiarthroid. The type species, E. enbensis, 

 was fouml in fresh-water streams near Santiago, Cuba. 



In 1870 Prof. S. I. Smith (Trans. Conn. Acad, ii, p. 150) gives a more 

 detailed description of ^. cuhensis, and describes another species, E. ar- 

 mata, probably from the Bahamas. The generic diagiu)sis slumld be 

 amended so as to include species in which the frontal process nearly 

 joins tlie suborbital -lobe, the character being at best of doubtful value. 

 The following distinguishing characters may be added: A process pro- 

 jects from the upper side of the expiratory canal, and the exognath of 

 the external maxillipeds overreaches the ischium of the endognath. 

 Proc. N. M. 03 42 



