350 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



UCIDES OCCIDENTALS (Ortmann). 



Plates 114-116. 



Uca tma MILNE EDWARDS and LUCAS, d'Orbigny's Voy. l'Am6r. Merid. t 



vol. G, 1S43, pt. 1, p. 23. Not Uca una Latreille. 

 Uca Iwvis MILNE EDWARDS, Arch. Mus. Hist. Nat. Paris, vol. 7, 1854, p. 185, 



pi. 10, figs. 1, la (type-locality, Guayaquil; type in Paris Mus.). Not 



Uca laevis (lavis) Milne Edwards, 1837. 

 Ocdiplcura occidentals ORTMANN, Zool. Jahrb., Syst., vol. 10, 1897, p. 330. 



New name for Uca laevis Milne Edwards, 1854. 



Diagnosis. Carapace of male one and one-half times as wide as 

 long. Jugal region tuberculous. Lower margin of palm straight. 

 Second pair of legs of adult male the longest. 



Description. Carapace of male much wider than in U. cordatus. 

 Lateral margin marked by a very faint tuberculate line. Orbits a 

 little higher than in U. cordatus. Jugal regions 

 tuberculous. Chelipeds not so strikingly un- 

 equal in this species, more elongate, especially 

 the propoclal segments. Palms distinctly longer 

 than wide, their lower margins not dilated; the 

 spines of the inner surface and the margins are 

 smaller, more numerous, and more tuberculi- 

 form. Fingers very broad and flat, those of 

 the smaller chela not gaping but beset on the 

 inner surface with short, thick hair. Legs not 

 very long, resembling those of the female of 

 U. cordatus. The first three pairs are hairy 

 beneath; the last pair is nearly naked. Ridges 

 on the dactyli smooth. 



Color. Carapace olive-green, margined with 

 orange; claws, legs, and eyestalks deep red. 

 (Coksr.) 



Measurements. Male (2145), length of cara- 

 pace 54, width of same 80, length of larger pro- 

 podus 87 mm. 



Habitat. In the mud of mangrove swamps. They are taken at 

 low tide by thrusting one's arm into the deep holes in the mud. The 

 meat is of excellent flavor. (Coker.) 



Range. Lower California to Peru ; Valparaiso ( ? ) . 

 Material examined. 



San Salvador, Central America; Capt. J. M. Dow; male (2145). 

 Guayaquil, Ecuador; four specimens (Paris Mus.). 

 Las Vacas, in the region of Capon, Peru; mangrove swamps; Jan- 

 uary 23, 1908; R. E. Coker, collector; received from Peruvian Gov- 

 ernment; 1 male, 1 female (40490). 



FIG. 150. UCIDES occi- 



DEXTAL1S, AUUOMEX OF 

 MALE (40490), NAT- 

 URAL SIZE. 



