58 New Species of Batracian Reptiles. 
and black, and the reverse ; Abonigh the specific markings are 
more or less unchangea 
_ Though the frog is subjected to change of cuticle, this does 
not take place throughout the body at once, as in the serpent, 
but falls off in detached pieces. I could not determine how 
frequently this process was repeated ; but certainly not every 
‘eight days.’? With these preliminary remarks, | proceed to 
the more immediate object of this paper, the description of 
— new species 
- Rana flaviviridis. (Nobis. ) Yellow-throated green 
at Spring frog? Bartram, Manneceip otes 
Char. essent. “Body rather slibesy 3 abdomen large ; snout 2 
Jittle obtuse ; colour above clear lively green, beneath white : 
under the throat yellow; buttocks mottled with black spots. 
Dimensions. Length of the body three inches, of the hind 
legs four inches four tenths; breadth of the head one inch. 
escription. (Male.) Body rather contracted; abdomen 
enlarged; ‘prevailing colour green; skin smooth, with the 
epee pices of the sides, which are inbesleniaa the back is 
separated from the sides by a longitudinal cuticular fold; the 
sides are obsoletely spotted; tympanum very hie suboval, 
lane. ses k-coloured at es circumference, protuberant 
and green at the centre; buttocks and posterior part of the 
thighs chotfled with black spots; hehe and legs above marked 
with obsolete black bands; toes of the hind feet palmated, 
granulated, and of a blackish colour. 
Haint. Not very active; destitute of any RenUHE odour ; 
destructive to small fish, grasshoppers, an : 
Inhabit the middle states; abound in the waka of Phila- 
delphia. 
Sp. 2. Rana sylvatica. (Le Conte, Ann. of ve tts of 
. Hist. of ork, vol. 1. no. ix. p. 282.— 
Wood ice ) This species | had described os a 
the name of R. Pennsylvanica. 
Char. essent. Olive brown or drab colour above, white be- 
neath; a black vitta, commencing on the side of the snout, 
passes backwards dilating, and involves the eye and tympa- 
num; posterior extremities obsoletely fasciated. 
sions. ther smaller and more slender than the 
R. clamata. 
~ Description. Body long and wletdee snout rather elon- 
gated; a longitu Bic sk band on each side of the head, 
