20 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 78 



juxtaposed between the supraocular area and the occipital plate; 

 occipital large, about one-fourth as broad as the breadth of the head ; 

 anterior border of tympanum Avith long projecting spines. 



Neck only slightly constricted, strongly plicate and pouched infer- 

 iorly; two complete and one incomplete gular folds, the latter's 

 halves distinct and continuous with a dorso-lateral fold on each 

 side, but failing to meet medially ; sides of neck with many tufts of 

 small, erect, spinose scales. 



Dorsal scales slightly larger than lateral scales; both dorsal and 

 lateral scales moderate, strongly keeled, with sharp projecting pos- 

 terior spines; dorsal crest moderate, serrations thin; dorso-laterai 

 fold covered with many small, erect, spinose scales; a second more 

 or less distinct fold on each side from axilla to groin ; ventral scales 

 about the same size as the largest dorsals but smaller than all of the 

 anterior caudals, smooth; limbs covered by large, keeled, imbricate 

 scales; infradigital lamellae distinctly keeled. 



The adpressed hind limb does not reach beyond the tympanum. 



Tail thick at its base, a little compressed, and with a moderate 

 dorsal crest. 



Grayish olive or greenish above, spotted and marbled with dark 

 brown; the brown reticulations forming more or less distinct cross- 

 bands on the back, tail and limbs ; a collar of blackish or slaty hue ; 

 throat and upper chest shaded or reticulated with gra}'^ ; other lower 

 surfaces yellowish. 



Dimensions (in millimeters). — Tip of snout to anus, 120; tip of 

 snout to second gular fold, 35; tip of snout to anterior border of 

 tympanum, 28 ; tip of snout to center of eye, 17 ; tip of snout to pos- 

 terior border of occipital plate, 24; width of head, 23; length of 

 front leg, 53 ; length of hind leg, 75 ; length from base of fifth hind 

 toe to tip of fourth toe, 27. 



Remarks. — This species is easily distinguished from umbra and 

 tuberculatum, by the characters used in the synopsis of the species 

 presented above. Its closest relative is plica with which it may be 

 best compared as follows : 



Character 



P. stejneoeri 



P. plica 



Supraoculars 



Dorsal crest 



Serrations of dorsal crest 



Size of dorsal scales 



Posterior tibials 



Legs 



Smaller, not band-like 



Moderate 



Thin 



Moderate 



Strongly spinose 



Short and heavy 



Larger, bandlike. 

 Low. 



Usually much thicker. 

 Small. 



Not spinose. 

 Longer and more 

 slender. 



The tail of the type specimen is broken. 



This species is named for Dr. Leonhard Stejneger. 



