224 BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



Color. — Dorsal surface of carapace and chelipeds pale reddish 

 orange, deepest in color upon elevations of carapace and upon bases 

 of meral spines of chelipeds; carapace beneath, the sternum, abdo- 

 men, and under surfaces of chelipeds and legs are white very slightly 

 tinged with reddish. 



Measurements. — Male, Tortugas, station 21, 1932, length of cara- 

 pace 43 ; width 42 ; length of larger meral spine measured from sinus 

 20; length of smaller meral spine 5 mm. 



Range. — From Massachusetts to the Windward Islands; 45 to 208 

 fathoms. 



Material examined. — See table 72, page 226. 



ACANTHOCARPUS BISPINOSUS A. MUne Edwarda 



Plate 68, Figures 1-3 



Acanthocarpus bispinosus A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, 

 p. 19, pi. 1, fig. 1, 1880 (type locality, reefs of the Grenadines, 140 fathoms; 

 holotype in M. C. Z.). — A. Milne Edwards and Bouvier, Mem. Mus. 

 Comp. Zool., vol. 27, p. 127, pi. 24, fig. 12; pi. 25, figs. 4-6, 1902.— Schmitt, 

 Carnegie Inst. Washington Year Book, no. 31 (1931-32), p. 288, 1932. 



Diagnosis. — Carapace circular, with a long lateral spine. Postero- 

 lateral margin tuberculate. No tooth on posterior margin and no 

 conical tubercle on sternal plastron. 



Description. — Carapace more circular and more coarsely granulate 

 than in alexandri, rostral teeth longer, posterolateral border furnished 

 with a series of tubercles behind the spine; posterior border less 

 produced on median hne; no conical tubercle on first article of sternal 

 plastron. A dense fringe of hair on exognath of outer maxilhpeds. 

 Meral spine more than half as long as width of carapace; hands 

 coarsely granulate, outer crest not prominent; striae of stridulating 

 ridge about 60, being finer and more numerous than in alexandri. 

 When touched or taken in the fingers under water, the crab may 

 set up such a vibratory grating of the hand against the suborbital 

 tubercles as to make one's fingers literally tingle. 



Color (66386). — Ground color of hinder third of carapace (behind 

 lateral spines) pale rose pink. Small spots and narrow strips defining 

 middle third of carapace light lavender gray. Anterior two-thirds of 

 carapace heavily spotted and speclded with scarlet-vermilion; longi- 

 tudinally shaded portions of spines the same but tinged with orange- 

 chrome; extreme tip whitish. Lower half of chelae rose-pink, upper 

 half darker, appearance due to scattered red specks on some of gran- 

 ules; teeth at top of chelae dirty white, fingers almost china white. 

 Ground color of legs rose-pink toward lower margins, which are more a 

 peach-blossom pink, upper margin nearly white; on anterior face of 



