THE CANCROID CRABS OF AMERICA 133 



LUPELLA FORCEPS (Fabricius) 



Plate 57 



Cancer 4 ^(larger long-shanked crab) Browne, Hist. Jamaica, 1756, p. 421, pi. 



41, fig. 2. 

 Cancer pelagicus Linnaeus, Syst. Nat., ed. 10, vol. 1, 1758, p. 626 (part). 

 Xaiva de horquilla Parra, Desc. difer. piezas hist, nat., Havana, 1787, p. 138, 



pi. 51, fig. 3. 

 Cancer forceps Fabricius, Entom. Sj^st. emend, et auct., vol. 2, 1793, p. 449 



(type-locality, "in Oceano" ; a specimen in the Copenhagen Mus. may be the 



type) . 

 Lupa forceps Leach, Zool. Misc., vol. 1, 1814, p. 123, pi. 54. — A. Milne Edwards, 



Arch. Mus. Hist. Nat., Paris, vol. 10, 1861, p. 352, pi. 28, figs. 1-lg.— Von 



Martens, Arch. f. Naturg., vol. 38, 1872, p. 95 (not L. anceps Saussure). 

 Lupella forceps Rathbun, Proc. Biol. Soc. Washington, vol. 11, 1897, p. 155; 



BuU. U. S. Fish Comm^. for 1900, vol. 20, pt. 2 (1901), p. 50. 



Diagnosis. — Chelipeds and legs long and narrow; fingers of male 

 filiform, much longer than palm. Lateral spine of carapace several 

 times as long as adjacent tooth. 



Description. — Carapace rather flat, hexagonal, granulate. Epigas- 

 tric and epibranchial lines rather well marked. Posterior margin very 

 wide, arcuate, meeting the postero-lateral margin at an obtuse angle. 

 Antero-lateral margin armed with eight very small, sharp teeth, 

 separated by wide sinuses; lateral spine long, slender, and extending 

 directly outward. The front (between antennae) is four-toothed, 

 teeth triangular, middle pair small and subacute, outer pair longer and 

 blunt. Inner orbital teeth broad, subtruncate; epistomal tooth 

 slender. Chelipeds smooth and remarkably long and slender. 

 Anterior border of arm with four to six slender spines; posterior border 

 with a spine at extremit3^ Wrist with a spine at inner angle, another 

 on outer surface. Hand prismatic, widening distally, with a spine 

 above articulation with carpus and another subdistal. Fingers very 

 slender, filiform in male, with numerous small teeth on their occludent 

 edges, tips acuminate. Ambulatory legs very compressed; merus of 

 swimming pair short, almost orbicular, armed above and below with a 

 terminal spine; propodus elongate; dactylus oval. Chelipeds of 

 females shorter and wider than those of males. In young males the 

 fingers are shorter than in adult males, and in females still shorter. 



Measurements.— -M&le (19360) length of carapace to median sinus 

 of front 24, extreme width 59.7, width at sinus between late.ral spine 

 and next tooth 42, length of propodus of cheliped 66.8, length of dac- 

 tylus of same 45.2 mm. Female (18290), length of carapace to median 

 sinus of front 33, extreme width 76.6, width at sinus between lateral 

 spine and next tooth 57.6, length of propodus of cheliped 56.6, length 

 of dactylus of same 30.6 mm. 



Range. — West Indies. 



