96 COLUBRID. 
thirds to twice as long as deep; one preocular, not in contact with 
the frontal; two postoculars; temporals 141; eight or nine upper 
labials, fourth, fifth, and sixth (exceptionally third, fourth, and fifth) 
entering the eye; five or six lower labials in contact with the 
anterior chin-shields, which are shorter than the posterior. Scales 
in 15 rows. Ventrals with feeble lateral keel, 175-190; anal 
divided ; subcaudals 115-135. Green above, yellowish beneath. 
Total length 650 millim.; tail 210. 
Tropical Africa. 
Q (V.182; C.117). W. Africa? (Type.) 
a. ; 
b. g (V. 178; C.128). Lagos. Dr. A. Giinther [P.]. 
e. 6 (V.186; C.1384). Lagos. 
d, 2 (V. 180; C.124). Lower Congo. M. A. Linden [C.]}. 
(Type of A. gracillima.) 
ed (V¥. 28is Osr), Angola. a il du Bocage 
f. 2 (V.188; C. 123). Coast of Zanzibar. 
8. Chlorophis irregularis. 
? Coluber cerulescens, Daud, Rept. vii. p. 54 (18035). 
Coluber irregularis, Leach, in Bowdich, Miss. Ashantee, p. 494 (1819). 
Dendrophis (Phflothamnus) albo-variata, Smth, Ill. Zool. S. Afr., 
Rept. pl. lxv. & pl. Ixiv. fig. 8 (1840). 
chenonii, Reimh. Vid. Selsk. Skrift. x. 1848, p. 246, pl. i. 
firs. 13 & 14. 
Leptophis chenonii, Dum. § Bibr. vii. p. 545 (1854) ; A. Dum. Arch. 
du Mus. x. 1860, p. 199; Jan, Icon. Gén. 50, pl. i. fig. 2 (1881). 
Ahetulla irregularis, part., Giunth. Cat. p. 152 (1858), and Ann. § 
Mag. N. H. (8) xi. 1863, p. 285. 
Philothamnus irregularis, var. longifrenatus, Buchh. § Peters, Mon. 
Berl, Ac. 1875, p. 199. 
irregularis, Peters, Mon. Berl. Ac. 1877, p. 615; Bocage, Jorn. 
Sc. Lisb. ix. 1882, p. 4, fig.; Boetty. Ber. Senck. Ges. 1888, p. 61. 
Aheetulla shirana, Ginth. Ann. § Mag. N. H. (6) i. 1888, p. 326. 
Chlorophis irregularis, Bouleng. Proc, Zool. Soc. 1891, p. 306. 
Philothamaus guentheri, Pfeffer, Jahrb. Hamb. Wiss, Anst. x. 1893, 
p. 85, pl. i. figs. 3-5. 
Rostral broader than deep, the portion visible from above mea- 
suring one fourth to one third its distance from the frontal; inter- 
nasals as long as or a little shorter than the prefrontals; frontal 
with concave lateral borders, once and one third to once and a half 
as long as broad, as long as or a little longer than its distance from 
the end of the snout, slightly shorter than the parietals ; loreal once 
and a half to twice and a half as long as deep (rarely absent); one 
preocular, in contact with or narrowly separated from the frontal ; 
two (rarely three) postoculars ; temporals usually 1+2, sometimes 
1+1 or 2+2; nine upper labials, fourth, fifth, and sixth entering 
the eye; five lower labials in contact with the anterior chin-shields, 
which are shorter than the posterior. Scales in 15 rows. Ventrals 
with moderately marked lateral keel, 150-182; anal divided (rarely 
entire); subcaudals 94-133. Green or olive above, scales often 
