416 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



dactyhis, 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. — ^langrove Point, Narborough Island, Gala- 

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

 type), 1 female (21829). Black Bight, Albemarle Island, Galapagos 

 Islands; Jan. 9, 1899; from Stanford Univ.; 1 male (25GGG). 



UCA STENODACTYLUS (Milne Edwards and Lucas). 



Plate 152, fig. 3 ; plate 153. 



Gelasimus stenodactyhis Milne Edwards and Lucas, in d'Orbigny's Voy. 



dans I'AniOr. ]\Ierid., vol. 6, 1844, Crust., p. 2G; vol. 9, atlas, 1847, 



pi. 11, fig. 2 (type-locality, V^alparaiso; type in Paris Mus.). 

 Gclasiiinis gibbosns 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.), 

 Vca stcnodactyla Oktmann, Zool. Jahrb., Syst, vol. 10, 1897, p. 35G (part). 

 Uca ylbbosa 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. 



