PROCEEDINGS 
OF THE 
WASHINGTON ACADEMY OF SCIENCES 
Vou. VIII, pp. 1-24. May 3, 1906. 
MEXICAN, CENTRAL AMERICAN, AND CUBAN 
CAMBARI. 
By A. E. OrTMANN, 
CARNEGIE MUSEUM, PITTSBURG, PA. 
Tue larger part of the material, upon which the following 
notes are based, was loaned to the writer by the Museum of 
Natural History of Paris through the kindness of Professor E. 
L. Bouvier, for which I wish to express my most sincere thanks. 
I am also under obligations to the Academy of Natural Sciences 
of Philadelphia, where I was granted the privilege of examin- 
ing the crawfish-collections ; some of this material has also been 
used for the following notes. 
I. Subgenus PARACAMBARUS, new subgenus. 
Paracambarus, new subgenus of Potamobiide (Camdbarus 
paradoxus ). 
Sexual organs of male with the two parts tn close apposition 
to their tips; in the male of the first form, both tips are shortly 
pointed and horny ; in addition there ts, on the posterior margin 
of the inner part, at a short distance from the tip, a long and 
strong, horny spine. Anterior margin of sexual organs with- 
out shoulder. Male with hooks on the ischiopodite of fourth 
peretopods only. Female with a spiniform process on the 
sternum between the fifth peretopods. 
The presence of hooks only on the fourth pereiopods of the 
male, and the peculiar spine of the sternum of the female dis- 
Proc. Wash. Acad. Sci., May, 1906. I 
