116 EEPTrLES. 



1. Nototrema marsupiatum. (Plate X. figs. B, B', B".) 



Hyla niarsupiata, Dnm. 8f Bihr. I. c. pi. 98 ; Guichenot, Rq>t. in Can- 

 teln. A'/iim, nouv. on rares cle rAmer. dii Stid, p. 86. 



Vomerine teeth in two series, in a straight line between the inner 

 nostrils. Above uniform bluish olive (in spirits), or greenish oUve 

 with bluish or dark green, black -edged longitudinal spots, and with 

 transverse bars on the extremities. 



a. Adult male. Mexico. From M. Parzudaki's Collection. 



b, c. Adult male. Andes of Ecuador. From Mr. Eraser's Collection. 



d. Female : pouch not developed. Andes of Ecuador. From Mr. 



Eraser's Collection. — Coloration uniform. 



e, f. Females : pouch not developed. Andes of Ecuador. From 



Mr. Eraser's Collection. — Back and extremities spotted. 



g. Female : with a pouch on the back, not extending above the sa- 

 cral region. Aiides of Ecuador. From Mr. Eraser's Collection. 

 — Coloration ixniform. 



h. Female : pouch filled with eggs. Andes of Ecuador. — From Mr. 

 Eraser's Collection. — Coloration uniform. 



i. Adult male. Andes of Ecuador. From Mr. Eraser's Collection. 

 — Uniform shining greenish brown. 



h. Adult male. Andes of Ecuador. From Mr. Fraser'sCoUection. =^. 



l-t. Adult and half-grown specimens. Andes of Ecuador. From 

 Mr. Eraser's Collection. 



Mr. Eraser collected, in the Andes of Ecuador, a series of these 

 animals, strikingly illustrating the changes to which the coloration 

 of this species and the pouch are subjected. The coloration is not 

 dependent on sex or on age, as is shown by the notices given 

 above. The females appear to attain nearly their full size before the 

 development of the pouch on the back. In specimen d. there is hardly 

 a trace of it to be seen. Specimens e. and /. are rather larger, and 

 exhibit two longitudinal folds of the skin along the ihac bones ; they 

 are united by a transverse fold, corresponding to the level of the 

 sacral vertebra (fig. B.) ; these folds are so low, that, at present, there 

 is no cavity between or beneath them. The pouch of the specimen g. 

 (fig. B'.), extending 2 miUim. upwards, may be considered as a further 

 degree of development ; but it may also be the contracted cavity, 

 the yoxmg frogs having left the back of the mother. I may add, 

 that the whole inside of the pouch of these specimens is provided with 

 a skin, identical with the external cutis and having the same color- 

 ation. Specimen h. (fig. B".) shows the pouch filled with eggs, ex- 

 tending to near the occiput, forming a separated sac between the 

 cutis and the dorsal muscles ; the entrance is very narrow, and con- 

 cealed in folds of the cutis. The inside is colourless. The eggs 

 appear to be very young, not yet exliibiting a trace of the fcetus. 



