500 



BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Diagnosis. — Subquadrate ; antero-lateral margin short, three-spincd. 

 Outer surface of both palms rough and hairy all over. Legs long 

 and narrow. 



Description. — Carapace narrow, relatively broad behind, postero- 

 lateral margins slightly convergent and twice as long as the antero- 

 lateral. Surface pubescent, with longer, very fine hairs interspersed; 

 a few short spinules scattered on antero-lateral region. Front with a 

 median V-notch, two subtruncate or slightly arcuate lobes with finely 

 denticulate edge, separated by a U-shaped sinus from the isolated 

 outer spine. Orbital margin finely denticulate and with a few 

 separated spinules above and several at the inner end below. 

 Eyes large, reniform. Antero-lateral margin with three spines, 

 none at orbital angle, first two spines long, slender, attached to broad 



bases, third spine slender 

 but much smaller and rather 

 closely appressed to side of 

 carapace. 



Chelipeds and legs thinly 

 clothed with long hair. 

 Margins of merus and dorsal 

 aspect of carpus and pro- 

 podus of cheliped spinous. 

 Chelae similar and not very 

 unequal ; their spines become 

 progressively smaller on outer surface of palms until below they are 

 sharp granules. Merus of ambulatory legs dilated, armed above, also 

 carpus and propodus with a row of slender curved spines, below 

 minutely spinulous; three terminal articles long and narrow, the 

 dactylus nearly straight down to the curved horny tip. 



Color. — In alcohol the spines are white, fingers light horn color, 

 tips white. 



Measurements. — Male holotype, length of carapace 5.5, width of 

 same 7, fron to-orbital width 6.2, width of front 2.8 mm. Female 

 (24242), length of carapace 5.7, width of same 7.1 mm. 

 Range. — Tortugas, Florida, and off St. Thomas, Virgin Islands. 

 Material examined. — White Shoals, Tortugas, Florida; July 19, 

 1924; station 25; W. L. Schmitt; 1 male (60822); gift of Carnegie 

 Institution. 



Off St. Thomas; February 6, 1899; Fish Hawk: Sail Rock, NW. 

 % W., 4 miles; 20 fathoms; Co.; temperature 25° C, station 6080; 

 1 female (24242). Sail Rock, W. by N. % N., 6 miles; 20-23 fathoms; 

 Co.; temperature 25.8° C; station 6079; 1 immature male (23771). 



FiauBE 80. 



-PiLUMNUS MAR3HI, MALE, X4. 



CHELA. 6. Carapace 



a. Major 



