Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 207 



Grapsus maculatus Milne Edwards, Hid., p. 167, pi. 6, figs. 1-ln, 1853. 



Grapsus ornatus Milne Edwards, Hid., p. 168, 1853. 



Grapsus altifrons Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, p. 



230, 1860. 

 Grapsus grapsus Ives, Proc, Acad. Nat. Sci. PMla., p. 90, for 1891. — 



Faxon, Mem. Mus. Comp. Zool., vol. 18, p. 30, 1895.— Rathbun, 



Bull. 97, U. S. Nat. Mus., p. 227, pis. 53-54, 1917 ; Bull. Amer. 



Mus. Nat. Hist., vol. 48, p. 629, 1923.— Boone, Zoologica, N. Y. 



Zool. Soc, vol. 8, No. 4, p. 244, fig. 90, 1927 ; Bull. Amer. Mus. Nat. 



Hist., vol. 58, No. 11, p. 577, fig. 13, 1929.— Rathbun, Bijdragen 



tot de Dierkunde, Natura Artis Magistra te Amsterdam, Aflev. 23, 



p. 18, 1924. 



Subfamily: Sesarminae. 



Genus : ARATUS H. Milne Edwards. 

 Aratus pisonii (H. Milne Edwards). 



Plate 70. 



Diagnostic characters : Carapace trapezoidal, frontal margin very 

 wide, four-lobed; front nearly vertical, entire. Chelipeds bristly 

 outside. 



Type: Prof. Milne Edwards' type came from the Antilles and is 

 deposited in the National Museum d'Histoire Naturelle, Paris. 



Distribution: Found near fresh, brackish or salt water in the 

 mangrove roots, near the tide line. Known from southern Florida 

 to Brazil on the East Coast, and from Nicaragua to Peru on the West 

 Coast. 



Material examined: One male taken on the shore at Catalina 

 Creek, Cuba, tag 91, by the "Ara." 



Technical description : Carapace trapezoidal, frontal margin very 

 wide, orbits extending to the anterolateral margin; front vertical, 

 four-lobed, about four times as long as deep ; its lateral margins sub- 

 parallel, the upper one margined by a line of granules, a decided 

 median groove separating the wider outer lobes from the inner 

 lobes ; posterior to the outer pair is a smaller pair of lobes. The lower 

 margin is divided by a median incision. The postorbital angles are 

 acute; the lateral margins are carinate, convergent, the posterior 

 margin is slightly rounded. There are a series of five or six, subpar- 



