jg B ATRAC HI A. 



1. RANA AURORA, B. & G. 

 (Plate II, figs. 1-6.) 



CAR. SPEC. Dentibus vomerinis minutis, parum numerosis, in duos 

 acervos oblongos oblique inter interiores nares et paido post illas 

 dispositis. Lingua parva. Tympano modico. Palmis plantisque 

 planis ; palmarum dlgitis elongatis. Ultimo plantarum digitorum 

 articulo Ubero. Parvum corneum tuberculum in plantarum digiti 

 base apparet. Cute Icevi, minutissime porosa. Plicatura dorsali 

 glandulari in utroque latere. 



SPEC. CHAR. Vomerine teeth minute, few in number, disposed upon 

 two oblong groups, obliquely situated between and a little behind 

 the inner nostrils. Tongue small. Tympanum of medium size. 

 Hands and feet underneath smooth ; fingers elongated. Terminal 

 joint of toes free; a small horny tubercle at the base of the inner 

 toe. Skin smooth, minutely porous. Two dorsal glandular folds, 

 one on each side. Ground color above greenish-yellow, with golden 

 reflections, maculated with black. A dark area behind the eye ; a 

 yellow line along the upper jaw. Sides of abdomen and hind legs 

 reddish-orange ; beneath dull-yellowish, maculated. Digital mem- 

 brane purplish-violet. 



SYN. Rana aurora, B. & G-. Proc. Acad. Nat. Sci. Philad. VI, 1852, 174. 







DESCR. The head is very much depressed, broader than long, and 

 even upon its upper surface. The snout is subconical, protruding 

 beyond the lower jaw, and declivous from the nostrils to its tip. The 

 canthus rostralis is even with the surface of the snout. The nostrils 

 themselves are elongated, and situated at the upper part of the lateral 

 declivity of the snout, half way between the anterior margin of the 

 eye and the extremity of the muzzle ; the membranous flap which 

 exists upon their posterior edge is thickened into a minute knob, 

 lying in a little depression. The eyes are moderate in size, and cir- 

 cular, with the iris black. The margin of the upper lid is quite thin, 

 and exhibits several folds, one anteriorly, the others posteriorly. The 



