20 ORTMANN 
examples generally are ¢rzdens, while the typical form is found 
only among old individuals, and is comparatively rare. 
Cambarus (Cambarellus) montezume dugest Faxon (1898, 
GOOn pl. O0,f0 7). 
Guadalajara, State of Jalisco, Mexico. — Diguet coll. (Mus. 
Paris; many specimens). 
Same locality. — Dugés coll. (Mus. Paris, 4). 
State of Guanajuato, Mexico. — Diguet coll. (Mus. Paris, 
43,4). 
The latter locality is the type-locality recorded by Faxon. The 
specimens from Guadalajara have been mentioned by Bouvier 
as C. montezume tridens (Bull. Mus. Paris, 1897, 224), but they 
clearly belong to this variety. 
Cambarus (Cambarellus) montezume occidentalis Faxon, 
(189850608, Zl. 00,7. Bs 7): 
Hot Springs, Huingo, State of Michoacan, Mexico. —S.N. 
Rhoades coll., 1899 (Philadelphia Academy ; many specimens).' 
VII. SYNOPSIS OF THE CRAWFISH-FAUNA OF MEXICO, CENTRAL 
AMERICA AND THE WEST INDIES. 
Our knowledge of the chorology of the genus Camdédarus, 
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, Procambarus, Cam- 
barus, Cambarellus. 'The first two are not found in the United 
States, while the other two are. Caméarus is largely distrib- 
uted in the United States, and has its main range there, only 
one species having invaded Mexico. Cambarellus 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). 
