112 OPHIDIA. 



1. WENONA PLUMBEA, B. & G. 

 (Plate VII, figs. 1-7.) 



CHAR. SPEC. Scutis frontalibus in tria paria dispositis ; pare medio 

 cum loreo coalescente, proinde ad labiales extendente. Scutis laltia- 

 libus in orbitum non productis. Colore plmnbeo-coeruleo supra; 

 infra vero albo-flavescente. 



SPEC. CHAR. Three pairs of frontal plates ; middle pair united to 

 the loral, and, consequently, extending to the labials. Labials not 

 entering into the rim of the orbit. Uniform bluish-lead color 

 above ; uniform yellowish-white beneath. 



SYN. Wenona plumbea, B. & G. Proc. Acad. Nat. Sci. Philad. VI, 1852, 176; & 

 Catal. N. Ainer. Kept. I, 1835, 139. 



DESCR. The upper surface of the head is slightly convex ; the 

 snout being rounded and prominent. The vertex plate is as broad 

 as long, obtuse-angled anteriorly, and rounded posteriorly. The post- 

 frontals are small and triangular ; the middle frontals, subangular in 

 shape, are transversely elongated, reaching the labials at the commis- 

 sure of the second and third, thus occupying the place of the loral. 

 The prefrontals are angular posteriorly, rounded anteriorly, reaching 

 the first labial, and occupying the* place of the prenasal. The rostral 

 is broad and large. The postnasal is subtriangular, elongated, with 

 its apex directed backwards. The nostrils are vertically elongated, 

 situated between the lateral expansion of the prefrontal and the post- 

 nasal. The occipitals are quite small and united in one plate, mayhap 

 exceptionally. The anteorbital is large, subpyramidal, its apex reach- 

 ing the upper surface of the head, where it meets the vertex one, being 

 produced between the supraocularies and the postfrontals. The supra- 

 ocularies themselves are subquadrangular, more developed upon the 

 surface of the head than in the rim of the orbit. There are four post- 

 orbitals; the uppermost being the largest, and by its elevated position 

 might be considered as a second supraoculary, whilst the inferior one, 

 which is the next in size, rests upon the fifth labial, and might be 

 taken for a second suborbital. The suborbital proper is large and 

 polygonal, situated upon the commissure between the fourth and fifth 



