Stejnegei — A New Species of Horned Tree-toad from Panama. 33 



Espada, from the Andes of Ecuador and Peru, but differs in the much 

 wider interorbital space and in the longer snout. 



With the adult specimen described above, there is a very young one 

 (No. 55,321, U. S. X. M.), only 17 mm. long, but fully developed. It 

 has evidently just been severed from its mother, as the two strings, issu- 

 ing one on each side from the chest near the shoulder look as if they had 

 just been ruptured. When received, the mother specimen had the back 

 covered with a loose flap of skin which came oft* easily when gently lifted 

 by the forceps. On the exposed side of this flap there are about 12 pairs 

 of whitish cords, apparently freshly ruptured and similar to the ones on 

 the chest of the young one, which indicate that at least so many young 

 ones had been attached to the mother's back just previous to capture. 

 This condition fully bears out the account given by Boulenger of the 

 closely related Cerathyla bubalus carrying its eggs on the back (Proc. 

 Zool. Soc. London, 1908, vol. 2, pp. 115-116). The young ones evidently 

 undergo their entire development while attached to the mother, after 

 which the skin of her back, to which the eggs adhered, sloughs off. On 

 the piece of skin shed there are distinct impressions of the outlines of the 

 eggs, apparently at least 14. This would indicate a larger number of 

 eggs than in C. bubalus, in the specimen of which recorded by Boulenger 

 there were only 9. 



In the adult specimen the neural spines of the dorsal vertebrae pro- 

 trude on the back like a series of saw-teeth. It is also worthy of notice 

 that the diapophyses of the sacral vertebrae are distinctly dilated. 



