38 SYNOPSES AND DESCEIPtlONb'i 



anal bifid or entii'e; 



toetli equal, smooth ; a loreal ; crown-sliields nine ; 



scales keeled, sometimes obsoletely, in 19 to 25 series 



Elaphis. 

 anal bifid ; 



posterior maxillary teeth longer, smooth ; loreal rarely absent ; 

 crown-shields nine Dromicus. 



Salvadora- 



Balrd J: Girard, 1853. 



Elongate, slender; head distinct from neck, long, snout produced; tail 

 slender, tapering gradually. Eye large, pUpil round. Posterior maxillary 

 teeth larger, smooth, isolated. Head-shields nine. Rostral prominent, 

 bent back on the head, edges more or less free. A loreal. Nasal divided, 

 Anteorbitals two to three. Postorbitals two to three. Scales smooth, gen- 

 erally in 17 rows. Anal bifid. Subcaudals in two rows. 

 Labials forming the lower edge of the orbit ; 



with longitudinal bands graliamii. 



Orliit separated from the labials by small shields ; 



with a dorsal series of blotches decurtata. 



Salvadora grahamiae. 



Baird & Girard, 1833, Cat N. Ainer. Serp., 104. 



Slender, fusiform ; head moderate, distinct from the neck, with flat crown ; 

 tail about one fourth of the total, slender. Eye large, pupil round. Snout 

 produced, truncate, inclined from a vertical. Rostral pronunent, with 

 free edges, bent back on the top of the snout. Crown-shields nine. In- 

 ternasals broad, separated in front by the rostral. Prefrontals broad. 

 Supraciliaries and frontal long. Nasal divided, nostril lateral near the 

 margin of the prefrontal. Loreals one to three. Anteorbitals two. Post- 

 orbitals three to two. Labials nine, eye over the fifth and sixth, seventh 

 largest. Temporals two, followed by irregular shields. Infralabials nine 

 to ten, fifth largest. Posterior submentals small. Scales smooth, in 17 

 rows, medial narrow, outer broad. Ventrals 175 — 186. Anal bifid, 

 Subcaudals 75 to 106 pairs. 



Top of the head yellowish brown, from this to the end of the tail extends 

 a medial band of dull yellowish one to three scales in Avidth. On each 



