412 



4. Streptophorus drozii, Dum. and Bibr. p. 518. 



A single specimen, which belongs to a very distinct variety ; the 

 collar is absent ; the body uniform black above, and brownish below. 



5. HOMALOCRANIUM MELANOCEPHALUM, L. 



6. CoRONELLA DECORATA, Gthr. Colubr. Snakes, p. 35. 



A single specimen, which somewhat differs in colour from those 

 described before, — the back and the sides of the belly being greyish- 

 black, and the yellow lateral band on the anterior part of the trunk 

 being reduced to three spots on each side of the head and neck. 



7. LlOPHIS COBELLA, L. 



A single small specimen. 



8. LiopHis T^NiuRus, Tschudi, Faun. Peruan. Herpetol. p. 51. 

 tab. 5 (not good). 



9. Herpetodryas ftjscus, L., young, = Dendrophis viridis, 

 Dum. and Bibr. p. 202. pi. 79 ; cfr. Gthr. Colubr. Snakes, p. 114. 



10. Herpetodryas erunneus, Gthr. Colubr., Snakes, p. 116. 



11. Herpetodryas rappii, Gthr. Colubr. Snakes, p. 116. 



Three examples, which differ from the typical specimens in having 

 one upper labial shield less, the anterior two being united into one ; 

 they all have the dark streak through the eye distinct. In one of 

 the specimens, thirty-one inches long, the three series of quadran- 

 gular spots continue to be distinct, whilst they have nearly disap- 

 peared in another of forty-one inches length ; this specimen has, 

 however, a pair of lighter indistinct longitudinal streaks, like some 

 specimens of Herpetodryas hoddcertii, running along the line where 

 the dorsal series of spots meets the lateral one. The throat in these 

 two specimens is spotted with black — not entirely black. The third 

 specimen, of thirteen inches length, is beautifully preserved ; the 

 ground colour of the back is white, and all the spots are of a deep 

 black ; the belly is black, with scattered white spots. 



12. Ah^tulla occidentalis, n. sp. 



Diagnosis. — Loreal shield none ; eight upper labials, the fourth 

 and fifth coming into the orbit ; the length of the snout equals the 

 distance between the eyes. Scales in fifteen rows, those of the back 

 keeled. Uniform green, rather darker on the back ; an indistinct 

 blackish temporal streak. 



Hab. The western parts of tropical South America (Ecuador, 

 Guayaquil, New Granada, Peru, Chile). 



This species has been confounded with the most common tree- 

 snake of eastern South America, Ahcetulla liocercus. Schlegel men- 

 tions a uniformly greenish variety of the latter from Chile (Essai, ii. 

 p. 226), undoubtedly identical with the present one. On a former 



