618 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 58. 



figures and descriptions only. At present, until authentic material is 

 available for comparison, it may perhaps better remain under this 

 caj^tion. 



24. LEPTODEIRA ANNULATA (Linnaeus). 



One adult (U.S.N.M. No. 60736) from the San Miguel Bridge, 

 near the ruins of Machu Picchu, in the Urubamba Valley, July 2, 

 1915. 



25. CLELIA PETOLA SEMIFASCIATA (Tschudi). 



One adult (U.S.N.M. No. 60684) from San Fernando, Cosireni 

 River. 



26. CLELIA CLOELIA (Daudin). 



One specimen (U.S.N.M. No. 60747) from Paltaybamba, 6,000 

 feet elevation, June 15, 1915 ; collected by E. C. Erdis. 



27. TACHYMENIS PERUVIANA (Wicgmann). 



Two adults from Chospiyoc, 10,000 feet altitude, on the Huaro- 

 condo River, April 20, 1915; five other specimens (U.S.N.M. Nos. 

 60722-4 and 60697-8) from the same region, at about 11,000 feet ele- 

 vation; another adult (U.S.N.M. No. 60721) from Cedrobamba 

 ruins, at timber line, 12,000 feet altitude, June 15, 1915 ; and another 

 (U.S.N.M. No. 60743) from Ollantaytambo, 9,400 feet, July 14, 1915; 

 all collected by E. Heller. Three adults (U.S.N.M. Nos. 60681-3) 

 from Pucyura, 9,500 feet collected by E. C. Erdis, June 15, 1915. 



This large series shows conclusively that Leim ado phis andicolus 

 Barbour ^ is identical with Tachymenis pe)'uvia7m. In some of the 

 specimens before us, such as the type of L. andicolus, the grooves in 

 the enlarged posterior teeth are very far from distinct. A similar 

 condition occurs in Coniophanes imperialis and Erythrolamprus 

 aesculapii. This suggests that the presence or absence of grooves 

 in the posterior teeth where the dentition is otherwise the same has 

 been greatly exaggerated as a taxonomic character, and we believe 

 that under the present system of classification many closely related 

 genera of snakes are often widely separated into different series by 

 a character of very trivial importance. 



28. ERYTHROLAMPRUS AESCULAPII TETRAZONA (Jan). 



One adult (U.S.N.M. No. 60728) from Yuveni, Rio Cosireni, Au- 

 gust, 1915. 



29. DREPANODON ERDISII Barbonr. 



One specimen (U.S.N.M. No. 60702), a topotype from Machu 

 Picchu, Urubamba Valley, at the San Miguel Bridge, July 2, 1915. 



30. DREPANODON EATON! Rathven. 



Another adult specimen (U.S.N.M. No. 60703), with data exactly 

 the same as its foregoing congener. 



iProc. Biol. Soc. Washington, vol. 28, 1915, p. 140. 



