THE BATRACHIA OF NORTH AMERICA. 141 



The palatine teeth form a series on each side in the shape of a short 

 arc, the convexity antero-interior. These do not meet internally, but 

 are separated by a short interval, as they are from the two plates of 

 parasphenoidal teeth, beginning a short distance behind them and ex- 

 tending backwards, meeting along the median line. The inner nostrils 

 are rather small, placed anterior and interior to the commencement of 

 the palatine teeth. Besides the broad, shallow, shortchannel proceeding 

 from the outer end of these nostrils past the external extremity of the 

 palatine tcetb, there is a deeper and very narrow one passing along the 

 upper edge of the broad channel and along the margin of the upper 

 jaw to its posterior extremity. 



6 1 



Fig. 31. Plethodon glutinosiis. ISTo. 3782, Abbeville, S. C; {. 



This species in alcohol is of a livid bluish-black. The upper parts 

 and sides are marked with well-defined specks of a grayish-silvery 

 color, looking like torn pieces of foil. These vary with the specimen, 

 but are generally more numerous and larger along the sides. The 

 under parts are sometimes finely dotted with whitish, but this is usually 

 the effect of the whitish glands seen through the integument. The 

 under part of the tail is of a pale bluish-gray. The light spot on the 

 chin, showing the attachment of the tongue, has already been referred 

 to. The soles of the feet are also whitish. 



The back is sometimes destitute of spots, or they are very minute 

 and these when present are often duller than those on the sides. There 

 is occasionally a yellowish tinge in the lateral spots. A few spots of 

 the same kind are sometimes found under the chin. 



Young specimens are marked like the adult, except in being whitish 

 beneath, and in frequently having the white spots more punctiform 

 and scattered. 



A number of young of eighteen lines in length from caves in Mont- 

 gomery County, Ya., have a series of small bright red spots on 

 each side ; some others from the same locality do not exhibit them. 

 The variation is thus remotely similar to that in Desmognathus fusca. 



I have not been able to discover any permanent difference between 

 the southern siiecimens of this species and the northern. I have 

 thought there was a greater tendency to expansion of the light spots on 

 the side, so as even to form a continuous band, and to a reduction in 

 size or disappearance of those on the back. I have, however, found 



