252 



INEZ WHIPPLE WILDER. 



As pointed out by H. H. Wilder ('99), Desmognathus fusca may 

 be conveniently distinguished from Spelerpes bilineatus, the other 

 lungless species with which it is usually associated in habitat, by 

 its more robust body, its general darker color, and less distinct 

 markings. In Desmognathus the markings become more and 

 more obscure with the increasing size and darkening color of the 

 older adults. In many even of the smaller adult Desmognathus 



\ 



FIG. i. 



Photographs of living adult Desmognathus fusca, in two characteristic 

 attitudes, about one half natural size. 



individuals the whole color becomes very dark and the ventral 

 surface thickly mottled with pigment spots, while Spelerpes 

 bilineatus remains practically unpigmented ventrally. The 

 larvae of the two species are, however, even more frequently 

 confounded. Their differences have been clearly shown by 



