506 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Habitat. — Lava rocks above water line (spray zone). 



Depth. — Shore. 



Remarks. — "Sally Lightfoot," as this well-known grapsoid crab is 

 commonly called, is abundant on all the islands of the Galapagos group 

 and, because of the contrast of its bright red carapace against jet black 

 lava, the m.ost conspicuous member of the crustacean fauna. The young 

 are so unlike the adults as to have been mistaken for another species, as 

 noted under Pachygrapsus crassipes Boone. The greenish-blue carapace 

 is spattered with creamy dots and the slender legs appear longer in pro- 

 portion to body size than in the more compact adult. Furthermore, the 

 young are occasionally obtained in shallow dredging, a situation in which 

 the adults would not be found. The loss of a leg or two to the bright-eyed 

 Galapagos bittern, a bird which stalks these crabs relentlessly, seems but 

 a temporary inconvenience, as a new appendage is soon regenerated. 



Genus GEOGRAPSUS Stimpson, 1858 



Geograpsus lividus (H. Milne Edwards) 



Plate 86, Figs. 3, 4 



Grapsus lividus Milne Edwards, Hist. Nat. Crust., vol. 2, p. 85, 1837. 

 Geograpsus lividus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 

 p. 230, 1860. Rathbun, Proc. U.S. Nat. Mus., vol. 21, p. 604, 1898; 

 Bull. 97, U.S. Nat. Mus., p. 232, pi. 55, and synonymy, 1918. Boone, 

 Zoologica, vol. 8, no. 4, p. 251, fig. 91, 1927. Sivertsen, Med. fra det 

 Zool. Mus., Oslo, nr. 38, p. 19, 1933. Schmitt, Smithsonian Misc. 

 Col., vol. 98, no. 6, p. 25, 1939. 

 Type locality. — ^Antilles. 

 Type. — In Paris Mus. 



Range. — From La Paz, Lower California, (Belding), to Chile; 



Galapagos Islands (Albatross); occurs also in the Atlantic and in Hawaii. 



Diagnosis. — Carapace subquadrate, sides little arched. Edge of front 



visible in dorsal view. Fingers with pointed tips. Legs conspicuously hairy. 



Material examined (46 specimens from 14 stations). — 



38-33. SE of Cormorant Point, Charles Island, shore, Jan. 29, 1933, 



2 males, 1 female. 

 49-33. Academy Bay, Indefatigable Island, shore, Feb. 3, 1933, 6 



males, 1 female. 

 56-33. Flamingo Bay, Charles Island, shore, Feb. 5, 1933, 5 males, 



5 females. 

 58-33. Cormorant Bay, Charles Island, shore, Feb. 6, 1933, 5 males, 

 1 female. 



