394 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.53. 



redescribed quadramaculata as distinct from the form long known as 

 D. nigra (Green). In 1908 Brown designated D.fusca (Rafinesque) 

 as the type of Desmognatlius. In preparing this revision I described 

 monticola and carolinensis. 



Passing from the systematic history of the group, one is struck by 

 the number of papers on the anatomy and physiology of one form: 

 fusca. This species, so easily obtainable throughout the East, has 

 served as the basis for the researches of the Wilder's on the peculiarities 

 of lungless salamanders. Mrs. Wilder has carefull}^ worked out its life- 

 history. Others have studied various phases of its morphology and 

 embryology, so that tliis animal is by far the best known of the 

 Plethodontidae. 



MATERIAL. 



Of Leurognathus marmorata I have seen six specimens. The type 

 and one collected by S. N. Rhoads, in the Academy of Natural 

 Sciences of Philadelphia; and two cotypes, an alcoholic and a skele- 

 ton, and an additional specimen hi the University of Pennsylvania; 

 and a larva in the American Museum of Natural History. 



Of Desmognathus 1 have exammed the following specimens: 1,093 

 in the United States National Museum; 1,105 in the Academy of 

 Natural Sciences; 526 in the American Museum of Natural History; 

 56 in the Museum of Comparative Zoology; 52 in the Museum of the 

 University of Pennsylvania; 144 in the Museum of Cornell University; 

 and 194 in my private collection, making a total of 3,170. 



The United States National Museum contains all the existing types 

 of species of Desmognathus, i. e., of D. hrimleyorum Stejneger, D, 

 monticola Dunn and D. ochrophaea carolinensis Dunn. 



ACKNOWLEDGMENTS. 



I desire to express my gratitude to Mr. Leonhard Stejneger, who 

 suggested this research to me, for his kind advice and assistance, and 

 for permission to study the collection of the United States National 

 Museum; to Mr. R. G. Paine and Mr. H. A. O'Dwyer, of the Division 

 of Reptiles, for help in studying the collection; to Dr. H. W, Fowler, 

 who allowed me to study the collection of the Academy of Natural 

 Sciences in Philadelphia, for his interest and suggestions; to Miss 

 Mary C. Dickerson, who gave me the opportunity to study the North 

 Carolina fauna in life, and who lent me the collection of the American 

 Museum of Natural History, in New York City; to Dr. Thomas 

 Barbour, who lent me specimens from the Museum of Comparative 

 Zoology, in Cambridge, Massachusetts; to Dr. Percy Moore, who gave 

 me the opportunity to study his specimens of Leurognathus and Des- 

 mognatlius in the University of Pennsylvania Museum, and who 

 permitted me to use his drawings of Leurognathus; to Dr. A. H. 

 Wright, of Cornell University, for the loan of specimens; to Dr. and 



