no.1766. STALK-EYED CRUSTACEA OF PERU RATHBUN. 55] 



UCA INSIGNIS (Milne Edwards). 



Plate 43, fig. 1. 



Acanthoplax insignis Milne Edwards, Ann. S<-i. Nat. (3), Zool., vol. is, L852, 

 p. 151, pi. 4, fig. 23; Arch. Mus. Hist. Nat., Paris, vol. 7, 1854, p. L62, pi. 

 II. figs. 1-16. 



Larger than U. princeps; carapace narrower, more uneven; side 

 margins with a few small blunt spines or tubercles. Front and eyes 

 similar to those of U. princeps. Large cheliped enormous; palm 

 tuberculated, fingers very broad and flat, the movable linger having 

 its widest point in the distal half. Merus joints of legs with blunt 

 spines beneath. 



Width of carapace about 45 mm., length of (law about 90 mm. 



Salt marshes back of Chulliyache (on Bay of Sechura). 

 Distribution. — From Gulf of Fonseca, Salvador, to Chile. 



UCA GALAPAGENSIS Rathbun. 

 Plate 40, fig. <i. 



Uca galapagensis Rathbun, Proc. Wash. Acad. Sci., vol. 4, 1902, p. 275, pi. 12, 

 figs. 1 and 2. 



Smaller than the other fiddler crabs, somewhat cylindrical, smooth; 

 front arched between the eyes, which are correspondingly shorter 

 than in the other species. Large cheliped granulate, relatively 

 smooth; ringers slender, the movable one longest, curving down past 

 the tip of the immovable finger. Legs narrow, noticeably hairy. 



Width about 20 mm. 



Sail flats at Puerto (irande on the Rio Zarumilla (2 leagues from Capon |, February 

 2, 1908. "Cangreiitos de lassalineras." 



Not before recorded from Peru. 

 Distribution. — Galapagos Islands; Peru. 



HEPATUS CHILIENSIS Milne Edwards. 

 Plate 37, lig. I. 



Hepatus chiliensis Milne Edwards, Hist. Nat. Crust., vol. 2, 1837, ]>. 117. 

 Hi jxituK cliilcn.sis Milne Kdwards and Lucas, d'< >rbigny's Voy. Amer. Mer., vol. 

 (i, pt. 1. L843, |>. 28; vol. <), atlas, is 17, pi. 1 I. 



Of good size. Carapace broadly oval, with the postero-lateral 

 margins concave, posterior margin narrow; surface a, little uneven: 

 margins crenulate; front narrow, truncate; orbits small, filled by the 

 eyes; below the orbit, a concave, subtriangular area,. Buccal cavity 

 triangulate, produced nearly to antennules. Chelipeds stout, folding 

 close to the body; hands with a superior, dentate crest and five ridges 



