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. 
6. Cambarus (Cambarellus) montezume dugest Faxon. 
State Guanajuato, Mexico (Faxon, Mus. Paris). 
Guadalajara, State of Jalisco (Bouvier, Mus. Paris, see above, 
p:/20). 
Pacific drainage. 
c. Cambarus (Cambarellus) montezume areolatus Faxon. 
Parras, State of Coahuila, Mexico (Faxon). Northern part 
of central plateau. 
d. Cambarus (Cambarellus) montezume occidentalis 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. diguetz) in the western extremity of its range (mountainous 
region toward the Pacific slope). The most extreme species 
(C. cubens7s) 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. mexzcanus), in Guate- 
mala, and British Honduras (C. willcamsonz and pilosimanus), 
thus indicating the direction of the dispersal (see Ortmann, Ann. 
Carn. 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 
