THE GBAPSOID CRABS OF AMERICA. 23 T 



Chelipeds in male one and one-half times as long as carapace, 

 shorter in the female. Inner border of arm laminate, and dentate at 

 the distal end. A tooth at extremity of outer border. Arm and 

 wrist crossed by transverse striae; wrist tuberculate above, as are 

 also the palm and the proximal half of the dactylus. Tooth at inner 

 angle of wrist short, obtuse, and very deep. Outer face of hand 

 almost smooth except for a longitudinal ridge running from the tip 

 of the pollex nearly to the wrist; lower edge obscurely tuberculate; 

 inner face finely striate, and with a few tubercles. Fingers widely 

 gaping at base in the male, dactylus with a large, low, basal tooth ; 

 pollex with a similar large tooth just distal to that on the dactyl. 

 Length of dactylus in male a little more than one and one-half times 

 the length of upper border of palm. 



First pair of legs shortest, third pair longest, about twice as long 

 as carapace. Merus of last pair twice as long as broad, merus of 

 other pairs longer. A spine at distal end of upper border of each 

 merus, and two or three small spines or teeth at distal end of lower 

 border of all save in the last pair. 



Variation. A variable species. Individuals differ in width of 

 carapace and legs, in the curvature of the side margins and the size 

 of their teeth, in the prominence of the frontal lobules and of the pos- 

 terior cardiac region, and of the sculptural lines. 



Color. Variable. Red and yellow mixed, or dotted with violet- 

 red, or sometimes whitish. " Bluish-gray, everywhere transversely 

 lineated and blotched with black; feet often reddish" (Stimpson). 



Measurements. Male (2129), length of carapace 54.8, width of 

 same 61.8 mm. 



Range. From Peru to Chile; Juan Fernandez. Pernambuco 

 (Kingsley.) Also Easter Island; Australia; New Zealand; Nor- 

 folk Island; Shanghai (Heller). 



Material examined. 



Callao or San Lorenzo, Peru; U. S. Expl. Exped.; 1 male (2328). 



Chincha Islands, Peru ; specimens in Copenhagen Mus. 



Cobija, Chile; specimens in Copenhagen Mus. 



Antofagasta, Chile; Nov., 1914; Dr. J. N. Eose; 1 male, 1 female 

 ovig. (49057) ; 2 specimens (49061). 



Valparaiso, Chile ; U. S. Exploring Exped. ; 1 male, 2 females, co- 

 types of Grapsus planifrons Dana (2343). 



Chile: Gilliss, collector; 1 male (2414). C. E. Porter; 1 female 

 (44520). 



Chile or Peru; U. S. Exploring Exped.; 4 males, 1 female (2129). 



Easter Island; Albatross: Dec. 16, 1904; 1 female (33196). Dec. 

 20, 1904; 2 males, 2 females (33195). La Perouse Bay ; Dec. 17, 1904; 

 4 males, 3 females (33197). 



Port Jackson, Australia; H. W. Parritt; 2 females (32439). 



