ENGYSTOMA CAROLINENSE. 25 



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. Diet. d'Hist. Nat, torn. vi. p. 4S9. t Hist. Nat. des Rept, torn. viii. p. 744. 



