116 HEPTFLES. 



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



Hyla marsupiata, Bum. S, Bihr. I. c. pi. 98 ; Guichenot, Rqd. in Cas- 

 teht. Anim. hquv. ou 7-ares de VAmer. (hi Sud, p. 86. 



Yomerine teeth in two .series, in a straight line between the inner 

 nostrils. Above luiiform bluish olive (in spirits), or greenish ohve 

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

 transverse bai's on the extremities. 



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



h, c. Adult male. Andes of Ecuador. From Mr. Fraser's Collection. 



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



Fraser's Collection. — Coloration uniform. 



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



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



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

 cral region. Andes of Ecuador. From Mr. Fraser's Collection. 

 — Coioi'ation uniform. 



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

 Fraser's Collection.— Coloration uniform. 



i. Adiilt male. Andes of Ecuador. From Mr. Fraser's Collection. 

 — Uniform shining greenish bro^vn. 



/.•. Adult male. Ajides of Ecuador. From Mr. Fraser'sCollection. =?. 



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

 Mr. Fraser's Collection. 



Ml'. 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 j)ouch 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 

 develo])ment 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 iliac bones ; they 

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

 sacral veriebra (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 mi11im. upwards, may be considered as a further 

 degree of development ; but it may also be the contracted ca\-ity, 

 the young frogs ha^ing left the back of the mother. I may add, 

 that the whole inside of the pouch of these specimens is jirovided 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 exhibiting a trace of the foetus. 



