THE GRAPSOID CRABS OF AMERICA. 417 



Ambulatory legs narrow; merus of first three pairs somewhat 

 dilated proximally. 



Abdomen of male with third to sixth segments fused. 



Measurements. Male (32322), length of carapace 8.5, width 

 of same 13 mm. 



Range. Gulf of Fonseca, Central America, to Valparaiso. Brazil 

 (Milne Edwards). 



Material examined. 



Gulf of Fonseca, Salvador; J. A. McNiel; 1 male, holotype of 

 Gelasimus gibbosus (M. C. Z.). 



Boca del Rio Jesus Maria, Costa Rica ; mangrove swamps ; April, 

 1905; J. F. Tristan; 1 male (32321). 



Puntarenas, Costa Rica; February, 1907; P. Biolley and J. F. 

 Tristan; 3 males (39098). 



Puntarenas, Estero side, Costa Rica; February, 1905; J. F. Tris- 

 tan; 3 males (32322). 



Panama City, Panama; Dec. 12, 1913; J. Zetek; 1 specimen 

 (48795). 



Valparaiso, Chile; 1 male, 1 female, cotypes (Paris Mus.). 



VGA MUSICA Rathbun. 



Plate 154. 



f Gelasimus annulipes BATE, in Lord's Naturalist in Vancouver Island and 



British Columbia, vol. 2, 1866, p. 271. ? KINGSLEY, Proc. Acad. Nat. 



Sci. Philadelphia, 1880, p. 148 (part: Vancouver). 

 Gelasimus gibbosus LOCKINGTON, Proc. California Acad. Scl., vol. 7, 1876 



(1877), p. 150 [6]. STREETS, Bull. U. S. Nat. Mus., vol. 7, 1877, p. 113. 



Not G. gibbosus Smith. 



Uca st&nodactyla OBTMANN, Zool. Jahrb., Syst., vol. 10, 1897, p. 356 (part). 

 Uca stenodactylus RATHBUN, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 603 



(not synonymy). 

 Uca, musica RATHBUN, Proc. U. S. Nat. Mus., vol. 47, 1914, text-fig. 5, pi. 



10 (type-locality, Pichilinque Bay, Gulf of California; holotype male, 



Cat. No. 22081, U.S.N.M.). 



Diagnosis. Third to sixth abdominal segments in male almost 

 completely fused. Oblique ridge inside palm bent at an obtuse angle ; 

 an oblique stridulating ridge near proximal, lower angle. Carapace 

 subcylindrical. 



Description. Very like U. stenodactylus but differs as follows: 

 The upper margin of the orbit is much less oblique ; the lateral angle 

 of the carapace, marking its greatest width, is farther back. The 

 granules of the palm are of more uniform size. The palm is scarcely 

 depressed near the immovable finger. The dactylus is more strongly 

 arched. The transverse ridge across the inner surface of the palm 

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