THE GKAPSOID CBABS OF AMEBICA. 249 



Chatham Island, Galapagos Islands ; Dr. W. H. Jones, U. S. Navy ; 

 1 female (17682). 



San Lorenzo Island, Peru; Dr. H. E. Ames, U. S. Navy.; 1 male 

 (17683). 



Oyster beds of Matapalo (near Capon), Peru; Jan. 23, 1908; R. E. 

 Coker, collector; received from Peruvian Government; 1 female 

 (40450). 



PACHTGRAPSUS GRACILIS (Saussure). 



WHARF CRAB. 

 Plate 60, fig. 3 ; plate 61, fig. 1. 



Metopograpsus gradlis SAUSSUKE, Mm. Soc. Phys. Hist. Nat. Geneve, vol. 

 14, 1858, p. 443 [27], pi. 2, fig. 15 (type-locality, St. Thomas; type in 

 Geneva Mus.). 



Orapsus guadalupensis DESBONNE, in Desbonne and Schramm, Crust. Gua- 

 deloupe, p. 47, 1867 (type-locality, Guadeloupe; type probably not 

 extant). 



Pachygrapsus gradlis STIMPSON, Ann. Lye. Nat. Hist. New York, vol. 10, 

 1871, p. 113. 



Orapsus (Leptograpxus) rugulosus VON MABTENS, Arch. f. Naturg., vol. 38, 

 pt 1, 1872. p. 108 ; not Leptograpsus rugulosus M. Edw. 



Diagnosis. One side tooth. Sides strongly convergent. Front 

 convex. Upper edge of movable finger tuberculate. Merus of last 

 leg dentate at posterior distal end. 



Description. Same size and general appearance as P. transversus ; 

 but may be distinguished by the following characters : 



Cardiac and intestinal regions smooth. Margin behind lateral 

 tooth concave or nearly straight. Front nearly two-thirds as wide 

 as carapace, edge convex, upper surface smooth, without granu- 

 lated line; upper lobes obsolescent, outer pair considerably wider 

 than inner pair. Orbit between one-third and one-fourth width of 

 front. Inner projection of wrist a sharp spine. Upper margin of 

 propodus and subinferior ridge stronger. Dactyli spinulous above. 

 Fingers irregularly toothed, nearly meeting when closed. Inner 

 surface of palm rough with tubercles. Abdomen broader. 



Color. Pinkish. 



Measurements. Male (24014) , length 12, width 15.9 mm. 



Habits. Found just above the water level on piles, wharves, etc. 



Range. From Bahamas and Florida to Bio Parahyba do Norte, 

 Brazil. Bermudas. 



Material examined. 



Green Turtle Cay, Bahamas; E. A. Andrews; 1 male, 2 females 

 (20715). 



Nassau, Bahamas; Dec. 25, 1898; Fish Hawk; 4 males (24014). 



Mariel, Cuba; on bushes and wharves; May 10, 1900; William 

 Palmer and J. H. Riley; 1 male (23818). 



