20 ORTMANN 



examples generally are tridens, while the typical form is found 

 only among old individuals, and is comparatively rare. 



Cambarus (Cambarellus) montezumce dugesi Faxon (1898, 

 660,//. 66,/. /). 



Guadalajara, State of Jalisco, Mexico. — Diguet coll. (Mus. 

 Paris ; many specimens). 



Same locality. — Duges coll. (Mus. Paris, 4 c?). 



State of Guanajuato, Mexico. — Diguet coll. (Mus. Paris, 



4^,4?)- 



The latter locality is the type-locality recorded by Faxon. The 



specimens from Guadalajara have been mentioned by Bouvier 



as C. montezumce iridens (Bull. Mus. Paris, 1897, 224), but they 



clearly belong to this variety. 



Cambarus (Cambarellus) montezumce occidentalis Faxon, 

 (1898, 661, pi. 66,/. 3, 4). 



Hot Springs, Huingo, State of Michoacan, Mexico. — S. N. 

 Rhoades coll., 1899 (Philadelphia Academy ; many specimens). 1 



VII. SYNOPSIS OF THE CRAWFISH-FAUNA OF MEXICO, CENTRAL 

 AMERICA AND THE WEST INDIES. 



Our knowledge of the chorology of the genus Ca.abarus, 

 south of the United States, is rather poor. Crawfish are now 

 known from Mexico, Guatemala, British Honduras, and Cuba, 

 but not only is the morphology of these forms not well under- 

 stood, but also we have only a few and often doubtful or unre- 

 liable locality-records. In order to call attention to this lack in 

 our knowledge, I want to condense here the known facts, and 

 point out the questionable records. 



Four subgenera are represented in this southern section of 

 the range of the genus : Paracambarus, jProcambarus, Cam- 

 barus, Cambarcllus. The first two are not found in the United 

 States, while the other two are. Cambarus is largely distrib- 

 uted in the United States, and has its main range there, only 

 one species having invaded Mexico. Cambarcllus has its main 

 abode in Mexico, and only one species is known from a single 

 locality in Louisiana (New Orleans). 



1 Huingo is near Lake Cuitzeo, and site of large salt works by evaporation 

 from natural springs flowing into the lake. Crawfish were numerous in these 

 springs and streams (communication from Mr. S. N. Rhoades to the writer). 



