414 



14. Leptognathus mikanii, Mus. Vienn. 



The specimens in the collection are darker-coloured than usually ; 

 some have additional prteoculars, some not ; and all have three pairs 

 of chin-shields, which do not differ in form from those of the Brazil 

 specimens. The lateral blotches extend on the belly, which is densely 

 marbled with black, and posteriorly entirely black. The white edge 

 of the dorsal spots is scarcely visible. 



15. Leptognathus catesbyi, Weigel. 



16. Oxyrhopus plumbeus, Wied. 



Scales in seventeen series, those of the dorsal series being distinctly 

 larger. In two of the specimens the loreal shield is united with the 

 posterior frontal. 



17. Oxyrhopus petolarius, L. 



A single specimen of a variety, apparently not yet recorded, has 

 been sent by Mr. Fraser. The scales of the dorsal series are a little 

 larger. The muzzle and crown are black, the neck red. The body 

 and tail are surrounded by thirty-three black bands, a little broader 

 than the red interspaces between. 



18. Elaps semipartitus, Dum. and Bibr. p. 1220. 



A single beautiful specimen with the colours preserved, thirty- 

 one inches long. The occipital region is light vermilion. The 

 ground colour of the trunk is yellowish-white and appears in very 

 narrow rings, which occupy two scales superiorly and two plates 

 inferiorly ; the ground colour of the tail is dark vermilion and forms 

 rather broad bands. The trunk is encircled by seventy-six black 

 rings, the tail by four. 



19. Craspedocephalus atrox, L. 



One of the young specimens has a whitish tail (Cr. leucurus, 

 Dum. and Bibr. p. 1508). 



20. Craspedocephalus bilineatus, Wied. 



A single adult specimen of this scarce snake is in the collection. 



21. Lachesis nitidus, n. sp. (PL XX. fig. C.) 



Diagnosis. — Nasal single ; eight upper labials, the second forming 

 the anterior margin of the loreal pit ; a series of rough scales between 

 the superciliary and the orbital margin ; all the caudal plates simple. 

 Twenty-two series of scales. Greenish-brown, speckled with black ; 

 pairs of darker spots along ail the back, the spots of each pair con- 

 fluent on the vertebral line, laterally including a red, superiorly yel- 

 low spot ; the yellow parts alternating with those of the other side. 

 A yellow longitudinal band along the two outer series of scales. 

 Belly yellow along the middle, brownish-green on the sides, the 

 latter parts being spotted with red and speckled with black. 



Hah. Western Andes of Ecuador, 



