Sere PROCEEDINGS OF THE NATIONAL MUSEUM. 633 
Anterior process of the epistoma triangular, the apex truncated or even 
notched. Antenne shorter than the body; scale broad, broadest 
near the tip. Chelipeds stout, chela broad, punctate, external margin 
convex, internal margin furnished with a double row of tubercles; 
fingers slightly gaping, costate, with longitudinal rows of ciliated 
dots; external margin of movable finger with a line of ciliated tuber- 
cles; tips of fingers incurved, corneous. Carpus smooth, furnished 
with a well developed internal median and small proximal and distal 
internal spines; beneath, the carpus has a well developed median 
anterior spine, and a very minute external spine at the point of articu- 
lation with the chela. Meros furnished with two obliquely placed 
ante-apical spines; of the biserial inferior spines the outer row is rep- 
resented by the two distal ones only. Third pairuf legs hooked. First 
pair of abdominal appendages very long, reaching the base of the 
chelipeds, tuberculate on inner border near the base, bifid, anterior bor- 
der carinate, rami straight, thick; the outer branch much longer than 
the inner, the tip slightly recurved, the inner branch blunt at the tip, 
‘and bent a little outward and bazkward. Dimensions: length 60™™; cara- 
pace, 29"; from end of rostrum to cervical groove, 18.5™™; from 
cervical groove to posterior margin of carapace, 9.5"™; breadth of ros- 
trum at base, 3.5"™; between lateral spines, 2.5"™; breadth of areola, 
2mm; abdomen, 31™™; chela, 23™™; breadth of chela, 10™™; movable 
finger, 13,5™™. 
Female: Chela smaller, fingers not gaping, external finger slightly 
bearded at the base within. Sternum between the fourth pair of legs 
not tuberculate. Annulus ventralis large, triangular, the anterior mar- 
gin obsolescent, posterior margin very prominent, projecting backward ; 
fossa transverse, deep, with a sigmoid sulcus. 
West Fork of Black River, Reynolds County, Missouri, R. E. Call 
(M. C. Z.). Four males, form II; two females. 
This species is closely related to CO. putnami Fax., but the sides of 
the rostrum are more thickened and more convergent trom the base to 
the lateral spines; the antennal scale is widest near the tip (in C. 
putnami it is widest in the middle); the carpus has a well developed 
anterior spine, and the annulus ventralis is very different. From 
C. spinosus Bundy, it differs in its longer metacarapace, shape of the 
rostrum, annulus ventralis, ete. 
Cambarus forceps Fax. 
Additional locality: Middle Fork of Holston River, Glade Spring, 
Virginia. D.S. Jordan (U.S. F.C.). Four males, form I; four females: 
The specimen from Knoxville, Tennessee, mentioned on page 121 of 
the Revision, surely belongs to this species. 
Cambarus montezume Saus. 
Additional locality: Guanajuato, Mexico. A. Dugés (U.S. N. M.). 
C. montezume is a variable species. In the specimens from Guanajuato 
