144 HULLETIN 34, UNITP]D STATES NATIONAL MUSEUM. 



degrees. Thej^ are separated from each other on the median line by a 

 short interspace and from the parasphenoids by a little longer one. This 

 form is quite different from that characteristic of the P. glutinosus. 

 There the series pass behind the choana^, sometimes even beyond their 

 external border, and from two arched series, not directed backwards in 

 any such degree as seen in the P. amens. The- parasphenoid i^atches 

 are close together, but a notch anteriorly and posteriorly indicates the 

 extremities of the line of separation. 



The internal digits on both feet are rudimental and terminate in a 

 single small i^halange, which does not extend beyond the extremity of 

 the second metapodial bone, and is connected with the latter directly 

 by the integument. The terminal phalanges of the other toes are trun- 

 cate and slightly expanded at the tips, as in the P. glutinosus. 



There are thirteen lateral dermal folds and a gular fold. The skin is 

 smooth everywhere. 



Measurements. 



M. 



Total length - 118 



Leugth of head and body 0525 



Length to groin 047 . 



Length to axilla 0185 



Length to rictus oris 007 



Length of fore-leg from axilhx . 0158 



Length of cubitus 0053 



Leugth of fore-foot ,:.j 006 



Length of hind leg 0175 



Length of tibia 0052 



Length of hind foot 0085 



Width of head 0083 



Width between eyes .0036 



4> 



t 



3 5 . 



Fig. 32. Plethodon ceneus Cope. S. Tennessee; \. 



The coloration is peculiar. Instead of the black color, with or with- 

 out pale bluish dots, of the P. glutmosus, the sides and back are thickly 

 spotted with largo yellowish-green blotches of irregular form, produc- 

 ing an effect something like the coloration of the Mexican Spelerpes Icp- 

 rosus. The dorsal spots are much larger than the lateral, and are often 

 confluent. On the head they almost exclude the ground color. The 

 spots on the sides are quite small, as are those on the feet. The lower 

 sides of the tail and belly are dusted with yellow, and the throat is also 

 dusted, and a little jnore coarsely than the belly. 



The characters which distinguish these species from the P. glutinosus 

 are the different form of the vomeropalatine series of teetb, the absence 

 of a costal dermal fold, and the coloration. There is some resemblance 



