14 'reptiles. 



beneath whitish; shields 172 -|- 74. Lenpjth 23 inches. Inhab. 

 Peru. 



Mus. Berlin. 



II. Head more or less shielded. 



a. Subcaudal plates tivo-rowed ; tail ending in a spine; cheeks not 

 scaly ; head-shield with some small additional plates in front. 

 Asia. Trigonocephalina. 



7. Teigonocephalus. 



Crown with large subnormal shield ,* dorsal scales keeled. 



Trigonocephalus, Boie^ 1827, 561. Fitz. 1826. Wagler, Amph. 

 173, 1830. Trigalus, Rafin. A. N. 77. Anat., Schlegel, Nova Act. 

 Leopol. N. C. xiv. t. 16,/. 4, 59, and Phys. Serp. 548. 



* End of nose shielded in front. 

 f Head moderate. Halys. 



1. The Halys. Trigonocephalus Hsiiys, Boie, Isis, 1827, 568. 

 Wagler, Amph. 174. Schlegel, P. S. ii. 552, t. 20, /. 4, 5. Gray, 

 Zool. Misc. 50. Licht. Eichw. Faun. Casp. 102, '^ 19, /. 1, 2. 

 Coluber Halys, Pallas, Russ. iii. App. 14. Eversm. Reise. 146, 

 Licht. Cat. 106. Col. Aspis ? E. W. Gray, MSS. Brit. Mus. 1800, 

 fide Shaw. Echidna Aspis, var. Pallasii, Merrem, Tent. 151. 



«, b. In spirits ; rather discoloured. Tartary ? 



2. The White-lipped Halys. Trigonocephalus affinis. 

 Olive, marbled with brown, with a series of brown spots on the 



lower part of the sides ; head moderate, triangular; scales all elon- 

 gate, keeled ; temporal streak broad, dark; lips white. 



a. In spirits ; not good state. ? Presented by Capt. Sir 



Edward Belcher. 



3. Blomhoff's Halys. Trigonocephalus Bloraboffii, Boie, 

 Isis, 1826, 214. Wagler, Amph. 174. Schlegel, Phys. Serp. ii. 552, 

 t. 20, /. 8, 9. Faun. Japan, t. 6. 



Brown, darker varied and spotted ; temple with a broad dark 

 streak from the back of the eye. 



a. In spirits. Japan. From the Leyden Museum. 



