ENGYSTOMA CAROLINENSE. 95 
~ 
has a white line along the posterior surface of the thigh, and a white spot at the 
axilla. Besides this our species differs in the comparatively greater size of the 
head and mouth, as well as in the markings. 
It is possible that Bosc* referred to this animal when he says he observed in 
Carolina a “crapaud bossu, ou une grenouille” living under the bark of dead 
trees, though he describes its skin as so excessively delicate as to prevent his 
preserving it alive even for a short time, in order to make a drawing of it. Now, 
though the skin of our animal is smooth and delicate, I have kept them alive for 
several months, and even sent them from Charleston to Philadelphia, where they 
not only arrived in safety, but lived a considerable time after. 
Dumeril and Bibron describe an Engystoma rugosat as inhabiting the United 
States, and suppose that I have confounded it with the Engystoma Carolinense. 
Now I never saw their Engystoma rugosa, and if I had, should never have mis- 
taken it for the Engystoma Carolinense, which has a smooth skin. The only 
ecaudate batrachian animal, with which I am acquainted, resembling an 
Engystoma in form and size, is the Bufo quercicus; but this is a true toad, with 
parotid glands, warty skin, &c.; whereas all the genus Engystoma, as I receive 
it, have smooth skins and no parotid glands. 
Their Engystoma rugosa is probably a Mexican animal, as they say it came 
from “des parties meridionales de l’Amerique du Nord.” 
* Nouv. Dict. d’Hist. Nat., tom. vi. p. 489. + Hist. Nat. des Rept., tom. viii. p. 744. 
