GRABSIDAE. 27 



Cardisonia rotundum (Quoy and Gaimard). 



Tlielphusa rotunda Quoy and Gaimard, in Freycinet's Voyage autour du mondo, 1825, 



Zool., 3, 527, pi. 77, fig. 1 (Thelphuse chaperon arrondi). 

 Cardisonia hirtipes Dana, l'roc. Acad. Nat. Sci. Phil., 1851, 5, 25.'!; Crust. U. S. Expl. 



Exped., 1852, 1, 378; atlas, 1855, pi. 24, fig. 2. 

 Cardiosoma hirtipes, Alcock, 1900, 69, 447. 

 Cardisoma rotundum Satford, Contr. U. S. Nat. Herbarium, 1905, 9, 90. Eathbun, 



Bull. U. S. Fish. Comm. for 1903 (1906) part 3, 838. 



Niue; Sept. 25, 1899; 1 9, juv. 



Besides the characters given by Alcock (he. cit.) for distinguishing this 

 species from the preceding, the following are very striking: — The width 

 (transverse dimension) of the orbit is about § of the anterior width of the 

 front, in C. rotundum; the width of the orbit is greater than the anterior 

 width of the front, in C. carnifex. The granulated line which marks the 

 anterolateral border of the carapace is not prolonged behind the level of the 

 gastro-cardiac suture, in C. rotundum; while the same line is prolonged far 

 behind the suture, in C. carnifex. 



In the 3 females of C. rotundum which I have examined, the antero- 

 lateral region of the carapace and also the chelipeds are much more roughly 

 granulated than in the males. 



GRAPSIDAE. 



Grapsus grapsus tenuicrustatus (Herbst). 



Grapsus grapsus tenuicrustatus Ratlibun, Bull. U. S. Fish Comm. for 1903 (190C), part 

 3, 838, and synonymy. 



Mohegan Reef, Rangiroa Id., Paumotus ; Sept. 21, 1879 ; 1 <?, 3 9 

 Rangiroa Id. ; beach ; Sept. 21, 1899 ; 1 9 . 

 Fakarava, Paumotus; reef, sea beach ; Oct. 13, 1899; 1 c?. 

 Makemo, Paumotus ; Oct. 29, 1899; H, 19. 



Grapsus strigosus (Herbst). 

 Grapsus strigosus Alcock, 1900, 69, 393. 



Tongatabu, Friendly Islands; shore; Nov. 29, 1899; 2, c? and 9 of small 

 size. 



