444 
Rostral moderate ; nostril in a single, semidivided nasal 
Rostral moderate ; nostril between two nasals and the 
internasal ; maxillary teeth subequal 
Rostral large, projecting, snout pointed . Ra 
Rostral moderate ; nostril between the nasals : 
two middle maxillary teeth much enlarged 
one or 
B. Scales keeled, in 19 or 21 rows ; eye 
very large .. 30 a-€ ae 
c. Pupil horizontal; eye large; scales in 
19 rows ; body very slender a6 
B. Eye small or very small ; head not distinct from 
ex 
. Sub-caudals in pairs ; 
Scales in ia rows ; no internasals ‘ 
Scales in 17 or 19 rows; internasals present 
2. Sub-caudals single. 
Scales in 23 to 27 rows; no preocular Hic 
Scales in 15 rows ; nasal in contact with a preocular 40 
UIE Proteroglyphe, with grooved fangs at the anterior 
end of the upper jaw.—Poisonous. 
A. Tail compressed, oar-shaped ; 
elongate ; 
snakes) 
B. te cylindrical, ending ina | point. 
. Head short. 
a. Scales in I7 rows or more; 
bordering the nostril. 
Rostral moderate ; scales smooth : 
Rostral moderate ; scales strongly keeled 
Rostral very large, detached on the sides ; 
or keeled on posterior part of body .. 
b. Scales in 13 or 15 rows. 
Nostril between two nasals; scales in 13 rows; 
small .. é 
Nostril in a single nasal ; 
small : 
2. Head narrow, elongate ; 
in 19 to 23 rows; 
no preocular. 
head narrow and 
no distinctly enlarged ventrals (Sea- 
internasal 
scales smooth 
eye 
‘scales in I 5 rows ; eye very 
- scales very oblique, 
body slender ye 
A.—AGLYPH. 
1. TROPIDONOTUS. 
Kuhl, Bull. Sc. Nat. i., 
Two Species in South Africa. 
1824, p. 81; 
Ventrals 162-180 ; anal entire 
Ventrals 131-149; anal divided 
1. TROPIDONOTUS LA&VISSIMUS. 
Natrix levissima, Ginth. Ann. & Mag. N. H. 
pl. ix. fig. 4. : 
Tropidonotus levissimus, Bouleng., t.c., p. 226. 
Grayia genidntee W. Sclater, Ann. S. Afr. Mus. 1:5 
fig. 
Cape Gare Natal. 
Tsomo, Transkei District.—Type of Grayia lubrica. 
(3) ix., 
THE SNAKES OF SOUTH AFRICA. 
Ampblorhinus. 
Trimerorhinus. 
Rhamphiophis. 
Psammophis. 
Dispholidus. 
Thelotornis. 
Amblyodipsas. 
Calamelaps. 
Macrelaps. 
A parallactus. 
Hydrus. 
Naia. 
Sepedon. 
Aspidelaps. 
Elapechis. 
Homorelaps. 
Dendraspis. 
Bouleng. Cat. Sn. i. p. 192. 
T. levissmus. 
T. olivaceus. 
1862, p. 124, 
1898, p. 109, pl. V, 
