THE SPIDER CRABS OF AMERICA 449 



A^. Hepatic region enlarged and produced separately from the curve of the 

 branchial region. 

 B'. Median spines of carapace 12 or 13. Marginal hepatic spines 3. 



spinimana, adult, p. 457. 

 B2. Median spines of carapace 9 or 10. Marginal hepatic spines 2. 



C. Median spines 9; none on posterior margin. Rostro-orbital region 

 occupying less than one-fourth of total length of carapace. 



macdonaldi, p. 460. 

 C^. Median spines 10; one on posterior margin. Rostro-orbital region 

 occupying more than one-fourth of total length of carapace. 



spinosissima, p. 455. 



ANALOGOUS SPECIES ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic 

 furcala 

 spinimana 



Pacific 

 contigua 

 macdonaldi 



STENOCIONOPS FURCATA (Olivier) 



DECORATOR CRAB; MACCA CRAB (JAMAICA FISHERMEN) 

 Plates 160 and 161 



Horned Crab Hughes, Natural History of Barbados, 1750, p. 266, pi. 25, fig. 3. 



Cangrejo Cornudo P.\rra, Descripcion de diferentes piezas de Historia 

 Natural, 1787, p. 135, pi. 50, figs. 2 and 3. 



Cancer fur catus Olivier, Encyc. Meth., Hist. Nat., Insectes, vol. 6, 1791, p. 

 174 (type-locality not given; type perhaps not extant). 



Cancer cornudo Herbst, Natur. Krabben u. Krebse, vol. 3, pt. 4, 1804, p. 6, 

 pi. 59, fig. 6 (type in Berlin Mus., 1896). 



Pericera cornuta Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 335; 

 Cuvier's Regne Anim., disciples ed., atlas, pi. 30, fig. 1. — A. Milne Ed- 

 wards, Crust. R^g. Mex., 1873, p. 51, and synonymy. ^^—Miers, Journ. 

 Linn. Soc. London, Zool., vol. 14, 1879, pp. 664 and 673, pi. 13, figs. 4 

 and 5. — Gundlach and Torralbas, An. Acad. Habana, vol. 36, 1899 

 (1900), p. 362, text-fig.; reprint, 1917, p. 19, pi. 4, fig. 10. 



Chorinus armatus Randall, Journ. Acad. Nat. Sci. Philadelphia, vol. 8, 

 1839, p. 108 (type-locality unknown; type in Mus. Phila. Acad. Nat. Sci.). 



Stenocionops furcata Rathbun, Ann. Inst. Jamaica, vol. 1, 1897, p. 6. 



Diagnosis. — Lateral marginal spines 4. Dorsum uneven, nearly- 

 smooth. One median spine, intestinal. Horns long, often curved. 



Description. — Body and feet covered with a close dark brown felt 

 composed of elongate pointed vesicles; there are also patches of 

 stiff, hooked hairs. Carapace oblong-ovate, not very uneven; a 

 rounded prominence on gastric and on cardiac region; intestinal 

 region with two median projections, the first very small; the other, 

 large, suberect, and curved, overhangs the posterior border. Frontal 

 horns large, very divergent at base; distally often subparallel or 

 even somewhat converging; on each side a superior orbital spine. 

 The lateral margins bear, besides the very sharp external orbital 

 angle, four very large, sharp spines, one hepatic and three branchial. 

 Basal article of antenna armed near the antero-external angle with a 



** " Pericera cornuta" was not cited by Latreille. 



