CAMBARUS. 49 
body, second and third segments furnished with minute blunt spinules, scale 
a trifle longer than the rostrum, very broad, broadest in the middle, truncate 
at apex, external terminal spine minute. Anterior process of the epistoma 
triangular, antero-lateral borders convex, rimmed, anterior angle truncate or 
notched in old specimens, with a projecting median spine. Third mavxillipeds 
densely hairy within and beneath. Chela long, slender, squamoso-tubercu- 
late, internal margin long, straight, strongly dentate ; fingers long, punctate, 
external border of movable finger tuberculate, inner border of both fingers 
toothed, a prominent tubercle near the base of external finger opposite a 
more or less clearly marked incision in the base of the thumb. Carpus 
triangular, obliquely truncate, inner margin armed with a stout spine and 
some low, scattered tubercles, lower side with two or three teeth and numer- 
ous small tubercles. Superior margin of meros with short. spines, which 
are sometimes obsolescent except the distal ones; below, the biserial spines 
are well developed. Sternum hairy. Third pair of legs hooked. First pair 
of abdominal appendages strong, straight, internal part with a very small, 
straight apical spine, which. does not reach the end of the external part; 
external part with two horny terminal teeth, one of which is flat and disk- 
shaped, the other slender and somewhat curved. 
Length, 97 mm. Breadth, 27mm. Length of carapace, 51mm, Length 
of areola, 18 mm. Width of areola, 1.3 mm. Length of rostrum, 11.5 mm. 
Length of chela, 50.5 mm. 
Male, form I1.—Chelipeds smaller, hooks on the third pair of legs smaller, 
first abdominal appendages without horny teeth at apex. 
Female.—Chelz smaller and shorter-fingered ‘than in the male ; annulus 
ventralis bituberculate in front, each tubercle denticulate. 
Known Localities. — Texas: Dallas; east of Canadian River (Coll. U. 5. 
Nat. Mus.). Kansas: Fort Hays. 
This species is remarkable in having the general form of body and claw 
of the C. Blandingii group of species, while the fact that only the third pair 
of legs are hooked places it in the C. advena group. The male appendages 
and the female annulus are very near to those of C. gracilis. In the shape of 
the body, areola, antennal scale, and claw, it resembles C. Blandingi’, var. acuta, 
but the rostrum is deeply excavated, and toothless even in small specimens. 
The full cephalothorax and large abdomen seem to indicate that it is not a 
pre-eminently burrowing species, like its allies, C. gracilis, C. advena, ete. 
There are specimens in the United States National Museum collected by 
