CAMBAKUS. 49 



body, second and third segments furnished with minute bhmt 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 epistonia 

 triangular, antero-lateral borders convex, rimmed, anterior angle truncate or 

 notched in old specimens, with a projecting median spine. Third maxillipeds 

 densely hairy Avithin and beneath. Chela long, slender, squamoso-tubercu- 

 late, internal margin long, straight, strongly dentate ; fingers long, punctate, 

 external border of movable finger tuherculate, 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, 27 mm. Length of carapace, 51 mm. 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 II. — Chelipeds smaller, hooks on the third pair of legs smaller, 

 first abdominal appendages without horny teeth at apex. 



Female. — Chela? smaller and shorter-fingered than in the male ; annulus 

 ventralis bituberculate in front, each tubercle denticulate. 



Kncnvn Localities. — Texas: Dallas; east of Canadian River (Coll. U. S. 

 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. advcna group. The male appendages 

 and the female annulus are very near to those of C. gnwilis. In the shape of 

 the body, areola, antennal scale, and claw, it resembles C. BhindiiKjii, var. imda, 

 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, G. gracilis, C. advena, etc. 



There are sj)ecimens in the United States National Museum collected by 



