126 SYNOPSES AND DESCRIPTIONS. 
TELEURASPIS. 
Cope, 1859. 
Moderately stout; head large, distinct from the neck, depressed, trian- 
gular, broad behind, narrowed in front; muzzle prominent, angular; tail 
short, tapering to a point. Crown-shields small, scale-lhke. Eye mod- 
erate, pupil vertical. Supraciliary replaced by small scales or with a row 
at the orbital edge. Scales keeled. Anal entire. Subcaudals entire or 
bifid. 
Subeaudals paired ; 
scales in 21 rows; an undulating band along the back 
undulatus. 
subcaudals entire; 
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. 
Trigonocernaus (ATRoPos) UNDULATUS Jan, 1859, Prodr. Icon. Ophid., 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 three infralabials. Scales keeled, in 21 rows. Ventrals 
177. Anal entire. Subcaudals 42 pairs. 
Greyish, 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. 
3orHRops (TELEURASPIS) NIGROADSPERSUS Steindachner, 1870, Sitz, Akad. Wien., p. 348, Taf. VIII. 
Head broad, depressed. 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, 
