XVI U. S. NATIONAL MUSEUM BULLETIN 206 



the realization that no key will suffice for the identification of every 

 individual in a variable species. 



The axillar wing, found in only a few species of frogs, is a membrane 

 extending from the arm part way down the side, and is apparent only 

 when the arm is placed at right angles to the body. This structure 

 is especially well developed in frogs of the Hyla marmorata group. 



Frogs of the famUy Centrolenidae from Brazil are reviewed in a 

 paper by Taylor and Cochran (1953). 



The present study includes frogs from southeastern Brazil- — Minas 

 Gerais, Rio de Janeiro, and Sao Paulo. The frogs of western Brazil — 

 Parand, Mato Grosso, and Goids, are not included in this paper, and 

 will be reported upon separately at a future date. 



Some specimens not from southeastern Brazil have been included 

 in these notes when they throw light on range or relationships of 

 frogs from the region under consideration. 



A great deal of observation needs to be done on the life histories 

 of many species, A comparison of tadpoles of members of the Hyla 

 rubra group should be made to see if there are some stable differences 

 in the larvae to augment the very fluctuating characters of the adults. 

 A new form of Phyllomedusa allied to guttata is indicated by the differ- 

 ence between the mouth parts of yoimg from Sao Paulo and those 

 of typical guttata from the State of Rio de Janeiro. 



It must be understood that the following discussion cannot be 

 considered complete or final for the frogs of even this relatively limited 

 area. Several species, known as yet from only a few specimens, need 

 further concentrated collecting and careful examination, while many 

 more species new to science are certainly yet to be found and named . 

 It is hoped, nevertheless, that some of the observations recorded 

 here, as well as the indication of the more obvious gaps that occur 

 in our knowledge, may stimulate further interest in Brazilian frogs. 



