GENUS 
GENUS 
GENUS 
GENUS 
GENUS 
GENUS 
GENUS 
DIVISION OPISTHOGLY PHA: bi oy) 
LEeptTopirA.—Maxillary teeth 15 to 18, gradually and feebly 
increasing in length, followed after an interspace by a pair of 
enlarged grooved teeth situated just behind the vertical ot 
the posterior border of the eye; mandibular teeth, anterior 
slightly enlarged. Head distinct from neck; eye large with 
vertically elliptic pupil; posterior nasal concave. Body cylin- 
drical or moderately compressed ; scales smooth or faintly keeled, 
with apical pits in 17 to 25 rows; ventrals rounded ; sub-caudals 
in two rows. 
CHAM2ToRTUS.—Maxillary teeth 12, gradually and feebly increas- 
ing in length, followed after a short interspace, by a large grooved 
fang situated below the posterior border of the eye; mandibular 
teeth sub-equal. Head distinct from neck; eye large with 
vertically elliptic pupil ; posterior nasal concave ; loreal entering 
the eye. Body compressed; scales smooth with apical pits, 
in I7 rows; ventrals obtusely angulate laterally. Tail long ; 
sub-caudals in two rows. 
AMPLORHINUS.—Maxillary teeth 12 or 13, gradually increasing 
in size, followed by an enlarged, grooved tooth; mandibular 
teeth sub-equal. Head distinct from neck; eye moderate with 
round pupil; nasal semi-divided. Body cylindrical; scales 
smooth or feebly keeled, with apical pits, in 17 rows; ventrals 
rounded. Tail moderate; sub-caudals in two rows. 
TRIMERORHINUS.—Mazxillary teeth 10 to 12, sub-equal, followed 
after an interspace by a pair of enlarged, grooved fangs, situated 
below the posterior border of the eye; anterior mandibular teeth 
strongly enlarged. Head distinct from neck; eye moderate, with 
round pupil; nostril crescentric, between two nasals and the 
internasal. Body cylindrical; scales smooth, with apical pits, in 
17 rows; ventrals rounded. Tail moderate; sub-caudals in two 
rows. 
RHAMPHIOPHIS.—Maxillary short, with 6 to g teeth gradually 
increasing in length and followed, after an interspace, by a 
pair of very large grooved fangs situated below the eye ; anterior 
mandibular teeth longest. Head distinct from neck, with 
projecting snout; rostral large, hollowed out beneath; eye 
moderate with round pupil; nostril crescentric in a divided 
or a semi-divided nasal. Body cylindrical; scales smooth, 
with apical pits, in 17 or 19 rows. Ventrals rounded. Sub- 
caudals in two rows. 
PSAMMOPHIS.—Maxillary teeth 10 to 13, one or two in the middle 
much enlarged, fang-like, preceded and followed by an inter- 
space, the last two, large and grooved and situated below the 
posterior of the eye; anterior mandibular teeth very strongly 
enlarged. Head distinct from neck, with angular canthus 
rostralis; eye moderate or large, with round pupil; frontal 
narrow. Body cylindrical; scales smooth, more or less oblique, 
with apical pits, in 1m to Ig rows; ventrals rounded. Tail 
long; sub-caudals in two rows. 
DisPHOLIDUS.—Maxillary short, widening behind, where it arti- 
culates with the forked ectopterygoid; teeth small, 7 or 8, 
followed by three large grooved fangs situated below the eye; 
mandibular teeth sub-equal. Head distinct from neck, with 
distinct canthus rostalis. Eye very large with round pupil; 
nasal entire. Body slightly compressed; scales very narrow, 
oblique, more or less strongly keeled, with apical pits, in 19 
