300 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Description. Carapace narrower anteriorly than posteriorly, 

 length less than anterior width. Supra-frontal lobes rough with 

 coarse, sharp granules and separated by slight depressions, inner 

 pair much wider than outer pair. 



Front nearly perpendicular, three and one-half times as wide as 

 high, its concave surface irregularly and coarsely granulous, lower 

 margin curved forward and nearly straight. 



Antero-lateral tooth acute, projecting well forward. 



Chelipeds short, stout; anterior angle of merus sharp, dentate and 

 raised in a thin crest at the distal end; carpus thickly beset with 

 sharp granules; palm short, outer surface very granulous, upper 

 margin a sharp crest. 



FIG. 148. SE.SAEMA (HOLOMETOPDS) OCCIDENTALS, MALE HOLOTYPE. a, ANTERIOR 



VIEW OF FRONT, X lg J &, CARAPACE AND EYES, DORSAL VIEW, X lg ', C, THIRD LEO, 

 X 1| 5 d, LEFT CHELA, OUTER VIEW, X 1| ; , LAST FIVE SEGMENTS OF ABDOMEN , 

 X 13 5 f, APPENDAGE OF FIRST SEGMENT OF ABDOMEN, X 7. 



Third leg two and one-half times as long as carapace, its merus 

 nearly three times as long as wide. 



Measurements. Male holotype. length of carapace 15.8, width of 

 same 17.6, anterior width 16.9, width of front 9.4 mm. 



Range. Acajutla, Salvador; Panama (M. C. Z.) ; Tumaco, Co- 

 lombia (Nobili). 



Material examined. Acajutla, Salvador; 1866; F. H. Bradley; 2 

 specimens of which 1 is type (Cat. No. 545, P. M. Y. U.). 



SESARMA (HOLOMETOPUS) CINEREUM (Bosc). 



WOOD CRAB; FRIENDLY CRAB; S<Jl"A UK-BACKED FIDDLER. 



Plate 83. 



dnereus Bosc, Hist. Nat. Crust., vol. 1, an X [ 1801-1802], p. 204, 

 pi. 5, fig. 1 (type-locality, "to Caroline"; type not extant). 



Grapsus cinereus SAY, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, 1818, 

 p. 442 (not 1817, p. 99). 



Senarma cinerea MILNE EDWARDS, Hist. Nat. Crust., vol. 2, 1837, p. 75 (not 

 all synonymy). 



