154 COLUBRID, 
the length of the snout; subcaudals 
ee, Te eee 4. punctulatus, p. 159. 
Sixth upper labial as long as the eye, : 
which is half the length of the snout; : 
subcaudals 1382 ..............500 5. trigranmus, p. 159. 
6. Four lower labials in contact with the anterior chin- 
shields ; eight or nine upper labials ; ventrals 151-168 ; 
subcaudals 100-108 ...... 6. subteniatus, p. 160. 
B. Rostral as deep as broad, well visible from above. 
1. Nineupper labials, three entering the eye; ventrals 161-173; 
subcaudals 109-127.......... 7. bocagii, p. 161. 
2, Eight upper labials, exceptionally seven or nine, two 
entering the eye. 
a. Frontal, in the middle, narrower than the supraocular ; 
ventrals 155-198 ; subcaudals 90-116. 
Preocular narrowly in contact with or 
separated from the frontal, which is as 
long as or longer than its distance from 
the end of the snout................ 8. sibilans, p. 161, 
Preocular extensively in contact with the 
frontal; snout short, forehead strongly 
RROOVER Sii3 5.35. Geeks ona eas 9. furcatus, p. 164, 
Preocularseparated from the frontal, which 
is considerably shorter than its distance 
from the end of the snout............ 10. longifrons, p. 165. 
b. Frontal, in the middle, nearly as broad as the supraocular ; 
preocular not reaching the frontal. 
Snout nearly twice as long as the eye; 
~ ventrals 156-182; subcaudals 75-90 .. 11. condanarus, p. 165. 
Snout once and a half to once and two 
thirds as long as the eye ; ventrals 153- 
163; subcaudals:64-95 ............ 12. brevirostris, p. 166. 
C. Rostral a little broader than deep, scarcely visible from above ; 
snout twice to twice and a half as long as the eye; nine 
upper labials, fifth and sixth entering the eye; ventrals 179- 
202; subcaudals 144-161 ...... 13. elegans, p. 167. 
II. Scales in 15 rows. 
Nine or ten upper labials (rarely eight) ; 
ventrals 142-164; subcaudals 100-131. 14. biseriatus, p. 168. 
Eight upper labials (rarely seven) ; ventrals 
136-155 ; subcaudals 62-81 ........ 15. crucifer, p. 169. 
III. Scales in 13 rows; ventrals 144; subcaudals 108. 
16. pulcher, p. 169. 
IV. Scales in 11 rows; ventrals 141-155; subcaudals 57-81. 
17. angolensis, p. 170, 
