532 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxi. 



ragua. The single American Potamon, P. {Geothelphusa) chilensis 

 (Heller), inhabits Chile. 



The evidence goes to show that each species of the Pseudothelphu- 

 sin?B inhabits a limited area, and that closely related species inhabit 

 adjacent areas. The only instances of the same species inhabiting 

 both continent and island are Ps. garmani, in Venezuela and Trinidad, 

 and Ps. americana and Ps. terrestris, both of which are found in Cuba 

 and Central Mexico. Each species of Epilohocera is restricted to a 

 single island or to two adjacent islands, as, for example, E. eubensis 

 and E. arniata to Cuba, E. gilmanii to the Isle of Pines, E. haytensis 

 to Haiti, and E. sinimtifrons to Porto Rico and Santa Cruz, which are 

 connected by a ridge at about 900 fathoms depth. The home of E. 

 grannlata is not known, further than that it is West Indian. The 

 species of Pseudothelplmsa inhabiting the Greater Antilles do not 

 extend farther east than Santa Cruz, being replaced in the Windward 

 Islands by P. dentata. 



Of continental species those having the greatest range are Ps. ma- 

 cropa, extending from Colombia to Bolivia ; Ps. xantnsi, from Mexico ( ?) 

 to Venezuela; Ps. richmondi^ from Nicaragua to the Isthmus; Ps. colom- 

 hiana, from Mexico to Colombia, and Ps. tuherciilata, from Guatemala 

 to Costa Rica. 



Costa Rica has yielded the greatest number of species of any one 

 region. This is due not to the sui)erabundance of species in this State, 

 but to the diligence of collectors, Mr. J. Fid Tristan and his colleagues 

 of the National Museum of Costa Rica, at San Jose, and Mr. H. Pittier, 

 of the Physical-Geographical Institute of Costa Rica, also at San Jose. 



It is worthy of note that in spite of the researches in Jamaica for 

 many years past, no fluviatile crab of the family Potamonidae has as 

 yet been recorded from the island. 



Following is a list of the species of Pseudothelphusinfe, with the 

 localities where each is found ; also a list of localities, with the species 

 found in each. Among the localities are given a few of doubtful value, 

 as "Antilles" and "Chile," both of which are left out of consideration 

 in the above remarks. 



LIST OF THE SPECIES OF PSEUDOTHELPHUSIN^, WITH LOCALITIES 



FOR EACH. 



Genus PSEUDOTHELPHUSA Saussure. 



cequatoriaVis (Ortmann). 



Ecuador (Strasbnrg Mus.). 

 affinis Eatlibuu. 



Cuba (Mus. Phila. Acad. Nat. Sci.). 

 agassizii Rathbun. 



Brazil: Para (Mus. Coinii. ZooL). 

 agrestis Rathbuu. 



Costa Rica: La Flor, Toiito, 900-100 meters (U. S. Nat. Mus., Costa Rica Nat. 

 Mus.); El Coronel, 700 meters (Costa Rica Nat. Mus.). 



