460 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Chelipeds rough; merus short, upper edge tuberculate, outer sur- 

 face broad, granulate, especially near the margins. Carpus coarsely 

 and irregularly ridged, interspaces rough, inner angle with a thick 

 blunt tooth and below it a smaller tooth. Propodus granulate and 

 rugose, a double ridge and intervening sulcus on the upper surface, 

 two faint longitudinal carinae on the outer surface of the minor 

 manus. Fingers of major chela slightly gaping, teeth few and large, 

 a strong tooth at base of dactyl; fingers of minor chela not gaping, 

 teeth more numerous, small and low. Merus of ambulatory legs 

 rough above; last two articles pubescent. 



Color. — Fingers black, tips lighter, yellowish-brownish black. 



Measurements. — Female holotype, length of carapace 8.7, width of 

 same 11.4, fronto-orbital width 7.3, width of front 3.8 mm. 



Range. — Florida Keys; West Indies, 



Material examined. — Off Sand Key, Florida; 120 fathoms; Eolis, 

 John B. Henderson; 1 male holotype (60828). 



Off Sambo Key, Florida; 120 fathoms; Eolis, John B. Henderson; 

 1 male, 1 ovigerous female (60829). 



South of Cuba; lat. 19° 56' 06" N., long. 75° 47' 32" W.; 254 

 fathoms; February 27, 1884; station 2134, Albatross; 1 immature 

 female (7815). 



Genus ECTAESTHESIUS Rathbun 



Ectaesthesius Rathbun, Proc. U. S. Nat. Miis., vol. 21, 1898, p. 591; type, E. 

 hijrons Rathbun. 



Carapace smooth, wider than in Trapezia and sides more arcuate, 

 bidentate, one tooth at lateral angle, the other further forward; 

 postero-lateral margins converging. Regions not indicated. Front 

 broad, shghtly bilobed. Orbits shallow, entire; inner hiatus closed 

 by union of lower orbital margin with front. Peduncular articles of 

 antennae short; the penult article just reaches lower corner of front; 

 the last article attains frontal margin. Palatal ridge partially devel- 

 oped, anteriorly obsolete. Antero-external angle of merus of outer 

 maxillipeds laterally produced, antero-internal angle emarginate. 

 Chelipeds of female unequal, smooth, not enlarged; arm short, 

 margins entire; wrist unispinous; fingers elongate, acute. Legs 

 short, last three articles setose; dactyli rather stout. 



Contains only one species. 



ECTAESTHESIUS BIFRONS Rathbun 



Ectaesthesius hijrons Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 591, 

 pi. 42, figs. 12-14 (type-locality, off Chatham Island, Galapagos Islands, 

 45 fathoms; type, Cat. No. 21586, U.S.N.M.). 



