57. DRYMOBIUS. 17 



than deep ; one prse- and two postoculars ; temporals 2 + 2 ; nine 

 upper labials, fourth, fifth, and sixth entering the eye ; five lower 

 labials in contact with the anterior chin-shields, which are shorter 

 than the posterior. Scales in 17 rows, dorsals keeled. Ventrals 

 158-169 ; anal divided ; subcaudals 114-117. Green above ; ven- 

 trals yellow in the middle, green on the sides ; young sometimes 

 with black cross bars. 



Total length 1280 millim. ; tail 400. 



Guatemala. 



8. Drymobius margaritiferus. 



Herpetodryas margaritiferus, Schleg. Phys. Serp. ii. p. 184 (1837), 



and Ahbild. pi. xliv. figs. 19 & 20 (1844). 

 Leptophis margaritiferus, Dtim. 8f Bibr. vii. p. 639 (1854). 

 Zamenis tricolor, Hallmo. Journ. Ac. Philad, (2) iii. 1855, p. 34, 



pi. iii. 

 Dromicus margaritiferus, Gunth. Cat. p. 126 (1858); Salvin, P)oc. 



Zool. Soc. 1860, p. 466. 

 Di-ymobiua margaritiferus, Cope, Proc. Ac. Philad. 1860, p. 561 ; 



Bocourt, Miss. Sc. Mex., Pept. p. 716, pi. xlix. fig. 2 (1890) ; 



Stejneger, Proc. U.S. Nat. Mus. xiv. 1891, p. 504. 

 Thamnosophis margaritiferus, Ja7i, Elenco, p. 82 (1863), and Icon. 



Gen. 31, pi. vi. tig. 3 (1869) ; Buges, La Nahiraleza, (2) i. 1888, 



p. 132. 

 Drymobius margaritiferus, var. occidentalis, Bocourt, I. e. p. 718. 



Maxillary teeth 24 or 25, posterior strongly enlarged. Eostral 

 broader than deep, visible from above ; internasals shorter than the 

 prsefrontals ; frontal once and a half to once and three fourths as 

 long as broad, as long as its distance from the rostral or the end of 

 the snout, as long as or slightly shorter than the parietals ; loreal 

 longer than deep ; one prseocular, not touching the frontal ; two or 

 three postoculars ; temporals 2 -)- 2 ; nine upper labials, fourth, 

 fifth, and sixth entering the eye ; five (rarely four) lower labials in 

 contact with the anterior chin-shields, which are shorter than the 

 posterior. Scales more or less distinctly keeled, in 17 rows. Ven- 

 trals 144-159 ; anal divided; subcaudals 101-126. Black above, 

 each scale green at the base and with a yellow elongate spot or 

 longitudinal streak ; head pale brown or olive above, black on the 

 temples ; labials yellow, with black sutures ; ventrals and subcaudals 

 yellow, black-edged. 



Total length 1260 miUim. ; tail 430. 



From South-western Texas and Mexico to Colombia and Vene- 

 zuela. 



a-h. c? (V. 153, 154, 154, Mexico. Hr. Hugo Finck [0.]. 



152; C. ?, 121, ?, ?) &. 



2 (V. 152, 154, 161, 



151 ; C. ?, ?, 107, 120). 

 i. rf (V. 148 ; C. 113). Mexico. M. Sall^ [C.]. 



k 2 (V. 145 ; 0. ?). Presidio, nr. Mazatlan. Hr. A. Forrer [C.]. 



Z.' Yg. (V. 151 ; 0. 122). Jalapa. Hr. Hoege [C.J. 



VOL. II. C 



