MEXICAN, CENTRAL AMERICAN, AND CUBAN CAMBARI 23 



were secured from a dealer, and it was not stated whether the 

 city or the state of Vera Cruz was meant. Moreover, it is well 

 known how utterly untrustworthy dealers' localities are. 



The presence of this species in its typical form is thus posi- 

 tively known only on the central plateau, near the cities of 

 Mexico and Puebla. 



b. Cambarus (Cambarellus) monteztnnce dugcsi Faxon. 

 State Guanajuato, Mexico (Faxon, Mus. Paris). 

 Guadalajara, State of Jalisco (Bouvier, Mus. Paris, see above, 



p. 20). 



Pacific drainage. 



c. Cambarus (Camba reikis) montczumce areolalus Faxon. 

 Parras, State of Coahuila, Mexico (Faxon). Northern part 



of central plateau. 



d. Cambarus (Cambarellus) montezumai occidcntalis Faxon. 

 Mazatlan, State of Sinaloa, Mexico (Faxon). 



Huingo, State of Michoacan, Mexico (see above, p. 20). 



Pacific drainage. 



It is hard at present to draw any conclusions from these 

 meagre records. Only a few remarks may be made, but it is 

 very likely that they will be subject to revision when more in- 

 formation comes to hand. 



The subgenus Procambarus possesses its most primitive form 

 (C. digueti) in the western extremity of its range (mountainous 

 region toward the Pacific slope). The most extreme species 

 (C. cubensis) is found at the eastern extremity of the range, in 

 Cuba. Intermediate forms are found on the central plateau and 

 the eastern hot country of Mexico (C. mexicanus), in Guate- 

 mala, and British Honduras (C williamsoni and fi/'los/mattus), 

 thus indicating the direction of the dispersal (see Ortmann, Ann. 

 Cam. Mus., 3, 1905, p. 441). 



Thus Procambarus not only points out the original home of 

 the genus in a general way (Mexico), but indicates especially 

 the western portions of this country. However, further research 

 is very desirable. 



Cambarus wiegmanni is the only representative of the sub- 

 genus Cambarus in Mexico ; the bulk of this subgenus being 

 found in the United States, chiefly in the southern parts (see 



