126 synopses and descriptions, 



Teleuraspis. 



Cope, 1859. 



Moderately stout; head large, distinct from the neck, depressed, trian- 

 gular, broad behind, narrowed in fi'ont; muzzle prominent, angular; tail 

 short, tapering to a point. Crown-shields small, scale-like. Eye mod- 

 erate, pupil vertical. Supraciliary replaced by small scales or with a row 

 at the orbital edge. Scales keeled. Anal entire. Subcaudals entu'e or 

 bifid. 



Subcaudals paired ; 



scales in 21 rows; an undulating band along the back 



undulatus. 

 subcaudals entii'e; 



no band behind the eye; with scattered spots of dark color 



nigroadspersus. 

 a band from the eye; with a dorsal series of lozenge-shaped spots 



nummifer. 



Teleuraspis undulatus. 



Trigonocephalus (Ateopos) undulatus /a?t, 1859, Prodr. Icon. Ophhh, 32. 



Supraciliaries replaced by prominent scales, forming a sort of crest; one 

 in particular is elongate, and constitutes an obtuse little horn. Crown cov- 

 ered by small carinate scales, a series of larger around the rostral angle. 

 Labials twelve, none touching the pit; separated from the orbit by two 

 scales. Infralabials thirteen. Submentals two pairs, posterior small ; ante- 

 rior in contact with thi-ee infralabials. Scales keeled, in 21 rows. Ventrals 

 177. Anal entire. Subcaudals 42 pairs. 



Grreyish, mixed with brown, an undulating brown band along the back. 

 Flanks with small black spots. Belly greenish-yellow, with small black 

 dots. (Jan.) Mexico. 



Teleuraspis nigroadspersus. 



BoTiiKOPs (Teleuraspis) niguoadspersus Steindachner, 1870, SiU, Akad. Wicn., p. 348, Taf. VIII. 



Head broad, dei)ressed. Body compressed; tail short. Nasal divided, 

 over the first labial. Two prominent shields at the outer edge of the large, 

 smooth supraciliary. Rostral angles sharp. Keeled scales on crown and 

 side of head; labials, pit-shields, nasals, and supraciliaries larger, smooth. 



