NO. 1158. FRESH-WATEB CRABS OF AMERICA— BATHBUN. 529 



EPILOBOCERA Stimpson. 



Epilohoccra Stimpson, Ann. Lye. Nat. Hist. N. Y., 1860, VII, p. 234. Type, IC. 



cuhensiH Stimpson. — Smith, TraiiH. Conn. Acad. Sci.. 1870, II, ]». 150. — Uath- 



IJUN, I'roc. U. S. Nat. Mnn., 1893, XVI, p. 0.57. — Outmann, Zool. .Jahrb., Syst., 



1897, X, pp. 298, 321. 

 Opislhocera Smith, Trans. Conn. Acad. Soi., 187(1, II, p. 148. Typo, (>. (/ilmanii 



Smith. 



In the genus Epilobocera are included those species in wliich the 

 exognjith exceeds the ischium of the endognath, and is sometiincs at 

 least provided with a palpus, and in which there is a tootli or spine in 

 the elTerent branchial channel. There is also a subcervical suture, 

 bordered on the posterior side by a granulated line. The spines on the 

 dactyli of the ambulatory legs are longer and more slender than in 

 PsendothclphHSdj and also more numerous than in any species of that 

 genus except P. macropa. The principal character assigned by Stimp- 

 son to this genus, the union of the inner suborbital lobe with the front, 

 is not constant. This lobe is usually separated from the front by the 

 width of tlie flagellum. 



I believe that the flrst description of an Epilobocera was made by 

 Herbst under the name Cancer Jluriatilis.^ Flerbst confused several 

 species in the synonymy, but his ligure was borrowed from the manu- 

 script of riumier's 'Zool. Americ.', and the description is evidently 

 based on tlie figure and not on the animal itself. No locality is given. 

 Plunder made three voyages to the West Indies and the neighboring 

 continent. Among the islands visited were Guadeloupe, Martinique, 

 and Santo Domingo. The species Cancer finvid til is approaches nearest 

 to U. cuhennis Stimpson, but its identity can not be determined with 

 certainty. Latreille named it Thelphiisa serrata.'- 



As above defined, the genus Epilobocera contains six species: E. 

 eubensis Stimpson (type species), E. sinuatifrons (A. Milne-Edwards), 

 E. armata Smith, E. (jilmanli (Smith, as Opisthocera), E. haytensis 

 Rathbun, and E. grnnulata Eathbun. 



Dr. Ortmann^ rejects the name eubensis for that species because 

 Stimpson in his specific diagnosis, "Superior frontal crest . . . not pro- 

 jecting beyond the inferior one," contradicts his generic diagnosis, 

 ^^Potaniocareino carapacemfrontemque similiSy'' and also Professor Smith's 

 statement that "the superior frontal crest projects considerably beyond 

 the inferior." Tiie truth is that different individuals of this species 

 vary in the amount of projection of the front. In large specimens 

 (about 52 by 84 mm.) the superior margin of the front is considerably 

 projecting, while in small specimens (about 20 by 31.3 mm.) the superior 

 margin projects scarcely at all over the surface of the front. 



Considering the correspondence in locality, there seems to be little 



'Natiir. Krabbon u. Krebse, 1785, I, p. 183, pi. x, p. 61. 

 2Nouv. Diet. Hist. Nat., 1819, XXXIII, p. 504. 

 3 Zool. .Jalirb., Syst., 1897, X, p. 322. 

 Proc. N. M. vol. xxi 34 



