THE CANCROID CRABS OF AMERICA 491 



PILUMNUS CARIBAEIIS Desbonne and Schramm 



Plate 200, Figures 3 and 4 

 Pilumnus caribaeus Desbonne and Schramm, Crust. Guadeloupe, 1867, p. 32 



(type-locality, Guadeloupe; type not extant). — Stimpson, Bull. Mus. 



Comp. Zool., vol. 2, 1871, p. 141. — A. Milne Edwards, Crust. Reg. Mex., 



1880, p. 284. 

 Pilumnus ? aculeatus von Martens [not Say], Arch. f. Naturg., vol. 22, pt. 1, 



1856, p. 91. 

 Pilumnus brasiliensis Miers, Challenger Rept., vol. 17, 1886, p. 151, pi. 13, 



figs. 2-2d (type-locality, near Bahia, 7 to 20 fathoms; type in Brit. Mus.). — 



Rathbun, Bull. U. S Fish Comm. for 1900, vol. 20, part 2 (1901), p. 40. 



Diagnosis. — Secondary spines or spinules on lateral margin. 

 Spines light horn color. Siiperhepatic spines wanting. Five or 

 more denticles or spinules on edge of each frontal lobe. 



Description. — Closely related to P. sayi; differs as follows: Fronto- 

 orbital distance greater. The hairy coating is softer and evenly 

 distributed on the dorsum, the long hairs slenderer than in sayi. 

 The larger spines of body and appendages are light horn color. No 

 superhepatic spines, subhepatic spine not large, marginal spines, 

 one or more, have a small secondary spine on the posterior slope. 

 Orbital spines numerous (7 or 8 above, 9 or 10 below), unequal but 

 none large. Median sinus of front U-shaped or somewhat button- 

 holed, lobes edged with five or more small spines or acute denticles. 



The outer surface of the manus in both chelipeds is rough but the 

 hair on the major manus is confined to the dorsal aspect or upper 

 proximal half while the lower distal half is naked. The spines on 

 the carpus and in the upper 3 or 4 rows of the manus are long, narrow 

 and curved, the spines of the manus become, from the upper rows 

 downward, gradually shorter, stouter and more conical until the 

 lower ones are pointed tubercles. The lower part of the outer surface 

 of the major manus may be smooth. The tuberculation of the lower 

 margin is more pronounced than in sayi. On the whole the spination 

 of the chelipeds is coarser than in sayi. The lower margin of the 

 major propodus is convex below instead of sinuous. Ambulatory 

 legs and horny tips of their dactyls shorter than in sayi. 



Measurements. — Female (31082), length of carapace including spine 

 17.3, width including spines 23 , width excluding spines 21.6 f ronto-orbital 

 width 16.6, width of front including outer or antennal spine 7.5 mm. 



Color. — Reddish with some spots of a dirty white, fingers black 

 (Desbonne and Schramm). 



Range. — From Bahamas and Florida Keys to Brazil. 



Material examined. — 



BAHAMAS. — 1903; B. A. Bean; received from Geographic 

 Society of Baltimore: Off Governor's Harbor; in oyster dredge; 

 July 7; 1 male, 7 females (31046). Off Green Cay; in oyster dredge; 

 June 30; 1 male, 3 females, 3 young (31082). 



