426 THE AMERICAN NATURALIST [Vol. LVI 



species of the Salamandridm are probably not wholly ac- 

 curate. Future work will perhaps indicate the afSnities 

 of Amphiuma, the Proteidce, and the Sirenidce. 



Of the larger families, the Hynohud(B are entirely 

 Asiatic, the Salammidridce are Eurasiatic with four 

 American species, the PlethodontidcB are American with 

 two species in Europe and four in South America, and 

 the Amhystomid(B are American with one Asiatic species. 

 As the Northern land masses have been connected with 

 each other during Tertiary times this distribution is 

 not extraordinary^ although close resemblance between 

 widely separated species is eloquent testimony as to the 

 antiquity of some of the "modern" forms. 



Twenty-two of the recognized genera and 105 of the 

 species are restricted to North America, 13 genera and 

 56 species are Eurasiatic, while three genera are found 

 both in North America and in some parts of the Old 

 World. 



Plethodon 11, Ensatina 3, 

 Hemidaciylium 1, Aneides 4, 

 Batrachoseps 6, Stereochihta 1, 

 Typhlotriton 1, Typhlomolge 1, 

 Gyrinophilus 2, Fseudotriton 5, 

 Euryoea 10, Hydromantes 3, 

 CEdipus 23, CEdipina 4. 



