THE CANCROID CRABS OF AMERICA 79 



PORTUNUS (ACHELOUS) SEBAE (Milne Edwards) 



Plates 34 and 35 



Cancer marinis, scuiiformis SEBA,Thesaurus, vol. 3, 1758, p. 52, pi. 20, fig. 9. 

 Portunus sanguinolentus Latreille, Tableau Encyc. Meth., pt. 24, Crust., 1818, 



pi. 272, fig. 6 (after Seba); (not P. sanguinolentus Herbst, 1783). 

 Lupea sebae Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 455 (type- 

 locality, Brazil; type in Paris Mus.). 

 Ne-ptunus sebae A. Milne Edwards, Arch. Mus. Hist. Nat., vol. 10, 1861, p. 329, 



pi. 28, figs. 2, 2a; Crust. R6g. Mex., 1879, p. 217. 

 Achelous sebae Smith, Trans. Connecticut Acad. Arts and Sci., vol. 2, 1869, p. 



34. — Verrill, Trans. Connecticut Acad. Arts and Sci., vol. 13, 1908, p. 380, 



text fig. 27 (after A. Milne Edwards) . 

 Lupa biocellata Forns in Gundlach and Torralbas, An. Acad. Cien. Habana, vol. 



37, 1900, p. 57, text fig. 78 (type-locality, Cuba; type in Acad. Cien. Habana). 

 Portunus (Achelous) sebae Rathbun, Bull. U.. S. Fish Coram, for 1900, vol. 2, 



1901, p. 46. 



Diagnosis. — An erect spine on basis, and a postero-distal spine on 

 merus, of swimming paddle. A large round red spot above each 

 postero-lateral margin. A longitudinal carina on manus just below 

 upper margin. 



Description. — Has much in common with P. {A.) ordwayi, namely, 

 the elevations of the carapace, the shape of the front and orbit, the 

 character of the lateral teeth, the fringes on the inner-upper margin of 

 the cheliped, and the shape of the male abdomen. On the other hand, 

 sehae attains a larger size; has a relatively wider carapace, not in- 

 cluding the lateral spine; a large red spot on the postero-lateral slope, 

 which persists in alcohol; all the spines except those of the front and 

 inner orbit have a dark horny tip; the lateral spine is as long as the 

 next 2)2 teeth in the old; chelipeds more elongate, less enlarged at 

 middle of merus and manus, one spine at extremity of ischium, six 

 or five spines on inner margin of merus veiled by a fringe of long hair, 

 posterior distal spine situated a little behind, not at, the extremity; 

 inner carpal spine same length as proximal spine of manus; upper- 

 outer surface of palm elongate, not enlarged or iridescent but bearing 

 a granulated carina just below upper margin; all the carinae of the 

 palm, 5 outside and 2 inside, more or less fringed with hair; two 

 superior spines, one at distal third, a small one at extremity; on the 

 basis of swimming paddles a curved spine directed Upward, outward 

 and forward; a spine at postero-distal angle of merus, and a second^ 

 smaller spine on the distal margin next to the articulation with the 

 carpus. 



Age variation. — As customary in the genus the lateral spine is 

 longer in the young than in the old; in a specimen (24498) about 13 

 mm. long the spine is exceptionally long, length equal to width of 

 next 5 teeth. 



Color. — General color, lighter end of Mars brown and of burnt um- 

 ber. Areolations picked out in red. Under parts white. Pubescence 



