CAMBARUS. 121 
= 
Length of chela, 16 mm. Breadth of chela, 7.5 mm. Length of movable 
finger, 10.5 mm. 
The largest female specimen is 60 millimeters in length. 
Locality. — Cypress Creek, Lauderdale Co., Ala. 
Nine specimens, four males of the first form and five females, collected 
by C. L. Herrick for the U. 8. National Museum, October, 1882. 
This is a small species with large hand, slender fingers widely separated 
at base and meeting only at the tips. In the female there is a heavy beard 
at base of external finger on the inner side. 
In the summer of 1872, 1 collected in a brook at Knoxville, Tenn., six 
specimens, three second-form males and three females, which closely resem- 
ble those obtained by Mr. Herrick in Alabama, and belong, I think, to the 
same species. The external finger of the males is densely bearded within at 
the base, as in the females from Alabama; the first abdominal appendages 
reach forward to the base of the second pair of legs, are bifid at the tip, the 
internal and external parts are thick, blunt at the tip, the outer somewhat 
longer than the inner, and slightly recurved at the tip. 
GROUP V. (Tyrr, C. Montezume.) 
Third segment of the second and third pairs of legs hooked. First pair 
of abdominal appendages of the male similar to those of the species included in 
Group IV. 3 
51. Cambarus Montezume. 
Plate II. fig. 6, Plate X. figs. 7, 7’, Ya, Ya’. 
Cambarus Montezuma, Sacvssure, Rev. et Mag. de Zool., 2° Sér., IX. 102, 1857. — Mém. Soc. Phys. Hist. 
Nat. Genéve, XIV. 459, Pl. III. fig. 22, 1858. 
Cambarus Montezume, vav. tridens, VoN Martens, Arch. Naturgesch., XXX VIII. Jahrg., I. 130, 1872. 
Cambarus Montezuma, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 149, 1884. 
Cambarus Montezume and C. Shufeldiii ave small species distinguished from 
all the others of the genus by having hooks on the third joint of the second 
and third pairs of legs of the male. In C. Montezuwne the rostrum is plane or 
lightly concave above, with a slightly raised margin; it varies much in its 
shape. In the typical form, as described and figured by Saussure, its mar- 
gins are subparallel from the base to near the extremity, where they con- 
16 
