416 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



dactylus, and sometimes one at distal third of same. Merus of first 

 three legs dilated. 



Measurements. Male (24829), length of carapace 5.6, width of 

 same 8.1 mm. 



Range. Galapagos Islands. 



Material examined. Mangrove Point, Narborough Island, Gala- 

 pngos Islands; March, 1899; from Stanford Univ.; 3 males (1 is holo- 

 type), 1 female (24829). Black Bight, Albemarle Island, Galapagos 

 Islands; Jan. 9, 1899; from Stanford Univ.; 1 male (2566G). 



UCA STENODACTYLUS (Milne Edwards and Lucas). 



Plate 152, fig. 3 ; plate 153. 



Gclasimus stcnodactylus MILNE EDWARDS and LUCAS, in d'Orbigny's Voy. 



dans l'Am6r. Merid., vol. 6, 1844, Crust., p. 26; vol. 9, atlas, 1847, 



pi. 11, fig. 2 (type-locality, Valparaiso; type in Paris Mus.). 

 Gclasimus gibbosus SMITH, Trans. Connecticut Acad. Arts and Sci., vol. 2, 



1870, p. 140, pi. 2, fig. 11; pi. 4, fig. 8 (type-locality, Gulf of Fonseca; 



type in M.C.Z.). 



Uca stcnodactyla ORTMANN, Zool. Jahrb., Syst, vol. 10, 1897, p. 356 (part). 

 Uca gibbo&u, HOLMES, Occas. Papers California Acad. Sci., vol. 7, 1900, p. 77. 



Diagnosis. Third to sixth abdominal segments in male incom- 

 pletely fused. Oblique ridge inside palm forming a right angle and 

 continued to upper margin. Carapace subcylindrical. 



Description. Small species. 



Carapace semicylindrical, narrowing little behind; surface smooth; 

 interregional depressions deep; antero-lateral region curving ab- 

 ruptly downward at the sides. 



Front less than one-quarter width of carapace, the sharp marginal 

 carina being obliterated on the anterior border. Upper margin of 

 orbit very oblique, slightly sinuous. Eyebrow very deep. The cara- 

 pace may be widest at the subrectangular antero-lateral angles, or a 

 little behind that point. The forward part of the side margins is 

 concave; the whole margin is sinuous. 



The merus of the large cheliped of the male is longer than the 

 carapace; its short, transverse, granulated lines are inconspicuous. 

 Wrist and palm granulate ; granules on lower half of palm smaller 

 and more flattened than those on upper half. A deeply depressd 

 area at the union of the palm with the immovable finger. Fingers 

 very slender and tapering, widely gaping; of the prehensile tubercles 

 there is a larger one near the base of the dactyl, another near middle 

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

 is bent at a right angle at the center, armed with a single row of large 

 tubercles below and a band of smaller ones above. Space smooth 

 between this ridge and the one at the distal end of the palm. 



