CAMBARUS. 79 
very prominent, ending in a spinule. Areola long and wide, plane, pune- 
tate, in length more than one half the distance between the tip of rostrum 
and posterior margin of the carapace; sides nearly parallel to within a 
short distance of the posterior margin, where they diverge. Telson bispi- 
nous on each side. Anterior process of epistoma broad. Antenne longer 
than the body, scale moderately broad, ending in long, acute apical spine. 
> 
Third pair of maxillipeds hairy within. Chelipeds moderate ; chela large, 
densely punctate, inner margin short, lightly serrate ; fingers long, with 
parallel rows of puncta, toothed within, outer one bearded within at base. 
Carpus broad, obliquely truncated, punctate above, with a strong median 
spine on the inner side and a small double one at the base; below, the 
carpus is armed with a spine on the anterior border. Meros smooth, with 
a single ante-apical spine on the upper edge; of the usual biserial spines 
beneath, only two or three at the proximal end are developed. Thoracic 
sterna naked, Third pair of legs hooked on the third segment. Fourth 
pair of legs with a small ovate basal tubercle. First pair of abdominal 
appendages articulated near the proximal end, stout, short, swollen in the 
middle ; external part with the compressed apex in the form of a strong, 
obtuse, recurved tooth, double within ; internal part recurved, cylindrical, 
short, acute. ; 
Female.—Annulus ventralis transverse, with a sigmoid sulcus. 
Measurements of an individual. — Length of body, 60 mm.; cephalo- 
thorax, 31 mm.; abdomen, 29 mm. From tip of rostrum to cervical groove, 
20 mm.; from cervical groove to hind margin of carapace, 11 mm. Width of 
areola, 3.5mm. Length of rostrum, 7.5 mm.; acumen of rostrum, 2.5 mm. ; 
chela, 20 mm.; inner margin of hand, 7 mm.; fingers, 13 mm.; antenna, 
58 mm. 
This species is near C. eztrancus, but differs m its longer and narrower 
areola, in the short hand and long fingers, the single superior ante-apical 
spine on the meros, naked thoracic sterna (in C. extraneus they are setif- 
erous), the greater smoothness of the body altogether, and the fineness of 
the punctation of the carapace; the suborbital angle is very much more 
projecting than in C. evtraneus. 
This species was discovered by Mr. C. L. Herrick in Cypress Creek, Lau- 
derdale Co., Ala., when collecting under the auspices of the U.S, National 
Museum, in October, 1882. The specimens obtained were two males, form 
II., and three females. 
