No. 396.] MWORTH-AMERICAN INVERTEBRATES. 959 
CAMBARUS, 
Distribution limited to Atlantic watershed except in Mexico. 
The following natural groups of the crayfishes of Eastern North 
America are recognized : 
1 First pair of abdominal appendages of the male clavate ; the outer 
part truncate at the tip and provided with one to three curved teeth ; 
the inner part terminated by a short acute curved spine. 
Third segment. of third.and fourth pairs of legs of males hooked. 
(“ Group I” of Faxon) 
C. blandingii, N. Y. to Ala. 
C. blandingii acutus, Ala„ Tex., 
Ind. 
C. fallax, Fla. 
C. hayi, Miss. 
C. clarkii, Tex. to Fla. 
C. troglodytes, Ga. to S. Car. 
C. lecontei, Ala., Ga. 
C. angustatus, Ga. 
C. pubescens, Ga. 
C. spiculifer, Ga. 
C. versutus, Ala., Fla. 
C. alleni, Fla. 
C. evermanni, Fla. 
C. barbatus, Ga. 
C. wiegmanni, M 
C. pellucidus, Ind, oe (Caves). 
C. pellucidus testiti, Ind. (Caves). 
C. acherontis, Fla. (Caves). 
Third segment of third pair of legs of males hooked. 
C. simulans, Tex., Kan. 
C. mexicanus, Mex. 
C. advena, S. Ga. 
C. gracilis, Ind., Ill., Mo. (?). 
(“ Group II ” of Faxon) 
C. carinatus, Mex. 
* C. cubensis, Cuba. 
C. carolinus, S. Car., Tex. 
(?) C. clypeatus, S. Miss. 
2 First pair of abdominal appendages of the male terminated with two 
falcate teeth, the larger of which belongs to the outer part of the 
appendage, the smaller to the inner part. Third segment of third 
pair of legs of males hooked. 
C. bartonii, N. B., Mo., N. C., Tenn. 
C. bartonii robustus, Dom. Can., 
Ill. 
C. longulus, Va., N.C., Tenn. 
** C. longulus longirostris, Va., 
Ala., Tenn. 
C. dubius, W. Va., Tenn. 
C. uhleri, Md. (“ eastern shore ”) 
. C. latimanus, S. C., Tenn., Miss. 
C. acuminatus, S.C., N.C. 
(* Group III” of Faxon) 
C. girardianus, N. Ala. 
C. extraneus, N. Ga. 
C. jordani, N. Ga. 
C. argillicola, Dom. Can., N. C., 
La. 
C. diogenes, N. J., Wy., Miss. 
C. diogenes ludovicianus, La. 
C. cornutus, Ky. 
C. hamulatus, Nickajack Cave. 
C: setosus, Caves in S. W. Mo. 
* C. cubensis = C. consobrinus Sauss. 
bartoni ; 
ee = C, 
ii longirostris Fax, 
