IV INTRODUCTION 



Thus without special aim to be consistent we have taken 

 up the various problems presented by recent workers, feeling 

 generally that it is our duty to record established custom 

 rather than to initiate or to follow hastily each proposed 

 change. 



Thanks are due to several of our North American co- 

 workers for advice and assistance. We would mention 

 especially Dr. Emmett Reid Dunn, Dr. Alexander G. Ruth- 

 ven, and Mr, Karl P. Schmidt. 



T. B. 



NOTE 



Two frogs described by Weed (Proc. Biol. Soc. Wash., Vol. 35, 

 Oct. 17, 1922, p. 107-110) seem to have scarcely the status of full 

 species, nor yet to be subspecies. Nevertheless they are not the 

 same as typical Rana pipiens, and pending more complete exami- 

 nation of their status we give them only this nominal mention. 

 They have been called 



Rana burnsi Weed 



and 



Rana kandiyohi Weed. 



