THE GBAPSOID GRABS OF AMERICA. 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). 



PACHYGRAPSUS GRACILIS (Saussure). 



WHARF CRAB. 



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



Metopograpsus gracilis Saussuke, M^m. Soc. Phys. Hist. Nat. Gengve, vol. 

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

 Geneva Mus.). 



GrapsMS guadalupensis Desbonne, in Desbonne and Schramm, Crust. Gua- 

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

 extant). 



Pachygrapsus gracilis Stimpson, Ann. Lye. Nat. Hist. New Yorls, vol. 10, 

 1871, p. 113. 



Grapsus {Leptograpsus) rugulosus von Maetens, 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.— MvilQ (24014) , length 12, width 15.9 mm. 



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



Range.— Fvom Bahamas and Florida to Kio 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 Eaxoh; 4 males (24014). 



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

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



