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THE AMERICAN .NATURALIST [Vol.XLVI 



pronounced variation in southern California specimens. 

 The heel of the limb when extended forward usually 

 reaches to the anterior border of the orbit, 9 but in young 

 individuals it often extends to the tip of the snout. 



The table also shows that there is a well-marked dif- 

 ference in the size of the sexes, the female being larger, 

 especially in the length of the body and hind limbs. 



BIBLIOGEAPHY 



brd, S. F. 



1854. Descriptions of New Genera and Species of North Ameri 

 Frogs. Proc. Acad. Nat Sri. Phila., p. 61. 



1859. United States and Mexican Boundary Survey, Batrachia, p. 

 pi. 38, figs. 4-7. 



1^-. Catalogue Bratrach. Salient., p. 373. 



18S7. Descriptions of New Reptiles and Batrachians in the Bri 



Museum. Annals and Magazine Nat. Hist., p. 53. 

 1S88. Description of New Brazilian Batrachians, Hyla copii. Am 



