ess PROCEEDINGS OF THE NATIONAL MUSEUM. 265 
Mithrax verrucosus Milne Edwards. 
Milne Edwards, Mag. de Zool., 1, pl. tv, 1832; Hist. Nat. des Crust., 1, p. 321, 1834. 
White, Cat. Brit. Mus. Crust., p. 6, 1847. Gibbes, Proc. Amer. Assoc. Adv. Sci., 
m1, p. 172, 1850. Guérin, in La Sagra’s Hist. of Cuba, p. 10, 1856. Stimpson, 
Amer. Jour. Sci., XXIXx, p. 132, 1860; Ann. Lyc. Nat. Hist.N. Y., vit, p. 187, 1860. 
(Desbonne and Schramm, Crust. de la Guadeloupe, p. 6, 1867.) Martens, Arch. 
fiir Natur., XXXVI, p. 82, 1872. A. Milne Edwards, Miss. Sci. au Mexique, pt. 
5, 1, p. 102, 1875. Miers, Challenger Rept., Zool., Xv, p. 86, 1886. Aurivillius, 
K. Sv. Vet.-Akad. Hand., Bd. 23, 1, p. 57, 1889. Pocock, Jour, Linn. Soc. Lon- 
don, XxX, p. 507, 1890. 
RECORD OF SPECIMENS EXAMINED. 
Big Pine Key, Florida, H. Hemphill (15075). 
Swan Island, Caribbean Sea; C. H. Townsend, 1887 (15074). 
Previously recorded from the islands of Fernando de Noronha and 
“St. Barthelemy.” 
Mithrax hispidus (Herbst). 
Cancer hispidus Herbst, Natur. der Krabben und Krebse, 1, p. 247, pl. XVI, fig. 100, 
1782. 
Maia spini-cincta Lamarck, Hist. Nat. des Anim. sans Vert., v, p. 241, 1818; 2d ed., 
p. 434, 1838. Say, Jour. Acad. Nat. Sci. Phila., 1, p. 458, 1818. 
Mithrazx spinicinctus (Desmarest, Consid. sur les Crust., p. 150, pl. xxii, figs. 1, 2). 
Guérin, Iconographie du Regne Animal, Crust., pl. vu, fig. 5, 1828. White, Cat. 
Brit. Mus. Crust., p. 7, 1847. 
Mithrax nispidus Milne Edwards, Mag. de Zool., u, 1832; Hist. Nat. des Crust., a0 
322.1834. De Kay, Crust. of New York, p. 4, 1844. White, op. cit.,p.6. Gibbes, 
Proc. Amer. Assoc. Ady. Sci., ur, p. 172, 1850. Saussure, Mém. Soc. Phys. de 
Geneve, XIv, p. 423, 1857. Stimpson, Amer. Jour. Sci., Xxrx, p. 132, 1860; 
Ann. Lye. Nat. Hist. N. Y., vi, p. 188, 1860; Bull. Mus. Comp. Zool., 1, p. 116, 
1870. (Desbonne and Schramm, Crust. de la Guadeloupe, p. 7, 1867.) Smith, 
Trans. Conn. Acad., U, pp. 2, 32, 1869; Amer. Jour. Sci., XLVI, p. 389, 1869. 
Martens, Arch. fiir Natur., xxxviu, p. 82, 1872. (Schramm, Rey. et Mag. de 
Zool., (3), WU, p. 342, 1874.) A. Milne Edwards, Miss. Sci. au Mexique, pt. 5, I, p. 
39, pl. xx1, fig. 1, 1875. Kingsley, Proc. Acad. Nat. Sci. Phila., XxXt, p. 390, 1879. 
Miers, Jour. Linn. Soe. London, Xrv, p. 667, pl. X11, figs. 7, 8, 1879; Challenger 
Rept., Zool., Xvi, p. 86, 1886. 
Mithrax pleuracanthus Stimpson, loc. cit. A. Milne Edwards, op. cit., p. 95, plo scx, 
fig. 3. Kingsley, loc. cit. Aurivillius, K. Sv. Vet.-Akad. Hand., Bd. 23, 1, p. 58, 
1889. 
Mithrax hispidus var. pleuracanthus Miers, op. cit., p. 88. 
_A comparison of a number of small specimens from many differ- 
ent localities leads me to believe that the plewracanthus of Stimpson is 
not even a variety, but merely the young form of hispidus. As a rule, 
the smaller the specimen the more tuberculous the carapace, the 
sharper the teeth or spines of the orbit and basal joint of the antenna, 
and the less evident are the punctures of the carapace. The specimens 
of medium size show characters intermediate between these and the 
large or typical hispidus, so that there seems to be no line where a sep- 
aration can be made into two distinct varieties. In many young speci- 
mens all the antero-lateral teeth except the last have a tendency to 
