92 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



limbs short-pubescent. Carapace uneven. Chelae long, subcylin- 

 drical. 



Description (after Smith). — A stout, thick species, with firm in- 

 tegument, everywhere covered, except dactylus of right, second leg 

 of female and tips of the other dactyli in both sexes, with a short, 

 close, clay-colored pubescence, like a uniform coat of mud. 



Female. — Carapace very convex in all directions; dorsal surface, 

 beneath pubescence, smooth and shining. Cardiac region protuberant, 

 separated from gastric region by a conspicuous sulcus, and from 

 branchial regions by very marked and deep depressions which extend 

 along cervical suture to hepatic region; branchial regions protu- 

 berant along their inner side; front not protuberant, strongly de- 

 flexed, a slight median depression. 



Maxillipeds more longitudinal and of a firmer consistenc}'^ than 

 usual; merus short and broad, inner margin angulated at middle; 

 second segment of palpus large, widest at middle v/here is attached 

 the terminal segment, which is slightly spatulate and reaches almost 

 to tip of propodus. 



Chelipeds very stout ; hands long, nearly cylindrical ; fingers some- 

 what cylindrical, nearly straight almost to tips, which are hooked by 

 one another ; dactylus with a small tooth near base which fits a slight 

 sinus in propodal finger. 



Legs stout; all ischial segments, as well as posterior margins of 

 propodus and dactylus of last leg, are clothed with a long, woolly 

 pubescence ; first 3 dactyli short, curved and pubescent nearly to tips 

 except in second right leg, where propodus is considerably longer 

 than left leg of same pair, and dactylus very long, almost straight 

 and naked; fourth dactylus long, straight, slender and pubescent. 



Anterior margin of sternum with a broad, rounded sinus for recep- 

 tion of tips of palpi of maxillipeds. Abdomen orbicular, covering 

 sternum. 



Male. — Smaller than female, less thickly pubescent, cardiac and 

 branchial regions less protuberant, separated from gastric region by 

 slight depression; front slightly projecting, less deflexed than in 

 female. Chelipeds and legs as in female, except that the right legs 

 are like the left. Abdomen widest at third segment, margins from 

 third to sixth straight and converging, sixth abruptly contracted, 

 last segment nearly square. 



Sterile female. — More like male than adult female, but narrower 

 and more depressed, front more prominent and scarcely deflexed; 

 dorsal surface slightly areolated, flat and clothed, except cardiac 

 region and a small space in middle of gastric region, with an almost 

 black, velvety pubescence. Cheliped stouter than in male and adult 

 female, a black pubescence on upper surface of carpus and a small 

 space at base of hand. Legs less pubescent than in male, propodus 



