446 REPORT OF NEW JERSEY STATE MUSEUM. 



Orbits extending all along front edge of carapace on either 

 side of comparatively narrow front. Eye-stalks long and slen- 

 der. Chelipeds in adult male strikingly unequal, in female 

 small and equal. 



The fiddler crabs may be distinguished by the modified claw 

 of the male, it being much larger than the other. Many species 

 have been described, most of which burrow in sandy beaches 

 or flats, muddy banks of streams and ditches in the salt marshes, 

 and one species ( Uca uiinax) extends up rivers quite into 

 fresh waters. 



Key to the species. 



a. Inner surface of palm of large cheliped without an oblique ridge. 



pugilator 

 aa. Inner surface of palm of large cheliped with an oblique ridge. 



b. Front between eyes very shallow and broad ; claws with red spots 



at articulations. niinax 



bb. Front between eyes very narrow, its sides oblique ; claws without red. 



pugnax 



Uca pugilator (Bosc). 



Plates 142 and 143. 



Fiddler Crab. 



Ocypoda pugilator Bosc, Hist. Nat. Crust., I, 1802, p. 197. Carolina. 

 Ocypodc pugilator Latreille, Hist. Nat. Crust., VI, 1803, p. 47 (on Bosc). 



Say, Journ. Acad. Nat. Sci. Phila., I, 1817, pp. 71, 443 (note). 



Gelasimus pugilator Latreille, Nouvelle Diet. Hist. Nat., XII, 1817, p. S^Q- 



Carolina. 



Leidy, Journ. Acad. Nat. Sci. Phila., (2) III, 1855, p. 149. Absecon 



and Great Egg Harbor, N. J. 



Stimpson, Ann. Lye. N. Hist. N. Y., VII, i860, p. 62. Virginia. 



S. I. Smith, Trans. Conn. Acad., II, 1870, p. 136, PI. 4, fig. 7- Gulf 



States to Massachusetts. 



Verrill, Rep. U. S. F. Com., I, 1871-72 (1873), p. 336. Sandy beaches 



near high water. 



• S. I. Smith, Rep. U. S. F. Com., 1871-72 (1873), p. 545. Cape Cod to 



Florida. 



Kingsley, Proc. Acad. Nat. Sci. Phila., 1878, p. 322. Cape Cod to 



Florida. 



