SYNOPSES AND DESCRIPTtoM 59 



Dromicus PUTNAMI. 

 Jan., 1863, Elenc. Sist. Qfid. 67; 1867, Icon, Ophid. TAvr., 24, pi Q,fig. 3. 



Moderately slender, belly broad; head distinct from neck, depressed, 

 narrow anteriorly; tail near one fourth of the total, tapering, pointed. 

 Eye moderate, pupil-round. Mouth-cleft deep, slightly curved. Crown- 

 shields nine. Rostral erect, broader than high. Internasals moderately 

 large. Prefrontals bent down on the side of the face. No loreal. Frontal 

 narrow, hexangular. Supraciliaries large. Parietals large. Nasal in two 

 parts. Oculars 1 — 2. Temporals 14-2-1-3. Labials eight, third, fourth, 

 and fifth in orbit. Infralabials ten, fifth and sixth large, third not in con- 

 tact with the submentals. Submentals two pairs, nearly equal. Scales 

 smooth, glossy, in 19 rows, dorsal narrow, lateral broader. Ventrals 171. 

 Anal bifid. Subcaudals 81 pairs. 



Light brownish, with a dorsal band of brown three and two half scales 

 wide. Outer row of scales a shade darker than the flanks. Belly lighter. 

 Dorsal band continuing forward on the head. A narrow light-edged brown 

 line from the eye toward the angle of the mouth. Total length 21f inches ; 

 tail 5^ inches. San Bias, Jalisco, Mexico. 



CORONELLINAE. 



Subcylindrical, moderate to stout; head more or less distinct from the 

 neck, which is rather stout; tail tapering, thick or slender. Snout mod- 

 erate. Teeth equal and smooth; or posterior larger, separated by an 

 interspace, smooth or grooved. Eyes small to moderate, pupil round 

 (except in Mesotes and possibly Hypsiglma). Scales smooth, or, in excep- 

 tional cases, keeled. 

 Posterior maxillary teeth longer, grooved ; 



scales in 17 to 21 series Tachymenis. 



scales in 15 series Erythrolamprus. 



Maxillary teeth compressed, posterior longer, smooth ; 



anal entire Ophirolus. 



Postmaxillary teeth longer, generally separated by an interspace; 



anal usually bifid Liophis. 



Teeth equal, smooth ; 



anal bifid Diadophis. 



rostral swollen, bent back on the snout Rhinocheilus. 



