SYNOPSES AND DESCRIPTIONS. 59> 



Dromicus PUTNAMI. 



Jan., 18G3, Elate. Shi. Ojid. r,7; lSr,7, Tmn. Ophifl. Lin:, 2i, pi. 6, fig. 3. 



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

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

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

 shields nine. Rostral erect, broader thnn high. Intel-nasals 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 l-|-24-3. 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 5J inches. San Elas, 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 Hypsiylcna). 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 Ophibolus. 



Postmaxillary teeth longer, generally separated by an intersi^ace ; 



anal usually bifid Liophis. 



Teeth equal, smooth ; 



anal bifid Diadophis. 



rostral swollen, bent back on the snout Rhinocheilus. 



