140 WENONA. 



perhaps accidentally. Anteorbital subpyramidal, apex reaching the 

 upper surface of head, touching the vertical, and produced between 

 the superciliaries and postfrontals. Superciliaries subquadrangular, 

 more developed on the surface of the head than in the orbit. Three 

 postorbitals, with rounded margins, upper one slightly the largest, 

 situated near the upper surface of head, and might be considered 

 as a second superciliary. Two suborbitals ; anterior larger, sub- 

 hesagonal, situated above the commissure between the 4th and 5th 

 labials; posterior rounded, oblong, above the posterior half of the 

 5th labial. Temporal shields numerous and small, scalelike. Cleft 

 of mouth slightly arched upwards. Upper labials 9 ; three anterior 

 ones much higher than the rest ; 5th broadest, none reaching the 

 orbit. Lower labials inconspicuous ; three anterior ones the largest. 

 Body subcylindrical, deeper than broad ; abdomen comparatively 

 narrow. Tail short, thick, blunt at its extremity. Scales small, 

 irregular, subelliptical, or s'ablozenge-shaped ; on the outer row very 

 large proportionally, higher than long. In the 2d row the scales are 

 still largor ; but in the remaining rows they become uniformly small, 

 scarcely diminishing towards the middle line of the back. On the 

 tail, hovrever, they are somewhat larger. 

 Puget ihund, Or. 206. 37. 45. 17|. 2i (on dep.) Expl. Exped. 



2. 'Q¥enona Isabella, B. & G. — Uniform isabel-color above, dull 

 yelloAf beneath. Tv:o pairs of frontal plates. An angular loral. Upper 

 4tli Pjid 5th labials entering into the orbit. A small anterior vertical be- 

 twef;n the postfrontals. Dorsal scales in 45 rows. 



fJTN. Wenona isabella, B. & G. Proc. Acad. Nat. Sc. Philad. VI, 1852, 176. 



Upper surface of head flat, snout subtruncated. Vertical broader 

 ^jhan long, rounded posteriorly. A small second vertical between 

 the postfrontals. Occipitals united in one small narrow plate. Two 

 pairs of frontals only; postfrontals much larger, subrounded, forming 

 on the right side a continuous plate with the loral, whilst on the left 

 side the loral is distinct from the postfrontal which itself is angular. 

 Prefrontals subangular, extending to the first upper labial, and occu- 

 pying the place of the prenasal. Rostral broad, obtuse angled above. 

 Anteorbital pyramidal, extending to the surface of the head, pro- 

 duced between the postfrontals and superciliary, and touching the 

 vertical. Superciliary proportionally larger than in W. plumhea, 



