546 ZOOLOGY— BATRAOHIAFS AND REPTILES. 



ft 19 rows scales ; 8 superior labials : 



Head short; eye large; two rows black lateral spots; a huge nuchal 



spot; spots below lateral band E. cyrtopsis. 



Dorsal band not bordered, bands from eye ; head narrower, no 



bands from eye ; lateral band indistinct ; dorsal bordered, 



E. sirtalis subsp. dorsal'is. 

 fft 19 rows scales ; 7 superior labials : 



Two series of spots between vertebral and lateral bands ; no light 



band on head; belly green; lateral band little defined below, 



E. sirtalis. 



No dorsal band ; spots scarcely visible on scales ; lateral indistinct, 



subsp. ordinatus. 

 a. Dorsal band : 



Spots all distinct subsp. sirtalis. 



Spots obscure ; space between bands uniform brown, 



subsp. obscura. 

 Spots large; of superior row united, forming a broad black band, 



subsp. parietalis. 

 Spots small ; a narrow line connecting superiors as border of 



band subsp. dorsalis. 



Spots confluent into a dark band: 



A lateral band (ac.) subsp. pickeringii. 



No lateral band subsp. pickeringii. 



Spots minute ; a black band on each side dorsal, and black band 



on fourth and fifth lateral rows subsp. tctratcenia. 



tftt Scales 17 rows: 



Labials 7 ; two rows of spots distinct ; none below the faint 



lateral E. cooperii. 



Black, with a broad yellow dorsal band only E. atrata. 



To assist in a proper recognition of the many species of this genus, 

 the following synoptic table is added: 



"A. — Lateral stripe on third and fourth row of scales; dorsal rows 19. 

 u *Body vera slender, elongated ; tail very long. 

 "E. saurita, B. and G. — Very slender; color above light-chocolate; 



