96 COLUBEIDiE. 



thirds to twice as long as deep ; one prsEoeiilar, not in contact with 

 the frontal; two postoculars ; temporals 1 + 1 ; 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. Yentrals with feeble lateral keel, 175-190 ; anal 

 divided ; subcaudals 115-135. Green above, yellowish beneath. 



Total length 650 millim. ; tail 210. 



Tropical Africa. 



a. 2 (V. 182; 0.117). W.Africa? (Type.) 



b. 6 (V. 178 ; C. 128). Lagos. Dr. A. Giinther [P.]. 



c. cT (V. 186; C. 134). Lagos. 



d. $ (V. 180; C. 124). Lower Congo. M. A. Linden [C.]. 



(Type of A. gracillima.) 



e. (S (V. 181 ; C. ? ). Angola. Prof. B. du Bocage 



/. ? l\. 188 ; C. 123). Coast of Zanzibar. 



8. Chlorophis irregularis. 



? Coluber cserulescens, Dcmd. liept. vii. p. 54 (1803). 



Coluber irregularis, Leach, in Boicdkh, Miss. Aslumtee, p. 494 (1819). 



Dendrophis (Philotharunus) albo-variata, Smith, III. Zool. S. Afr., 



Rept. pi. Ixv. & pi. Ixiv. fig. 3 (1840). 

 chenonii, Eeinh. Vid. Selsk. Skrift. x. 1843, p. 246, pl. i. 



figs. 13 & 14. _ 

 Leptophis chenonii, Bum. ^- Bihr. vii. p. 545 (1854) ; A. Dtmi. Arch. 



du Mm. X. 1800, p. 199; J(m, Icon. Gen. 50, pl. i. fig. 2 (1881). 

 AhffituUa irregularis, part., Giinth. Cat. p. 152 (1858), arid Ann. 8f 



Mag. N. H. (3) xi. 1863, p. 285. 

 Philothamnus irregularis, var. longifrenatus, Buchh. Sf Peters, Mon, 



Berl. Ac. 1875, p. 199. 

 irregularis, I'cders, Mon. Berl. Ac. 1877, p. 015 ; Bocage, Jwn. 



Sc. Lish. ix. 1882, p. 4, fig. ; Boettg. Ber. Senck. Ges. 1888, p. 61. 

 Ahajtulla sbirana, Gimth. Ami. S,- Mag. N. H. (0) i. 1888, p. 326. 

 Chlorophis irregularis, Bouleng. Proc. Zool. Soc. 1891, p. 306. 

 Philothamnus gueutheri, Pfeffer, Juhrb. Hunib. Wiss. Anst. x. 1893, 



p. 85, pl. i. figs. 3-5. 



Eostral 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 prgefrontals ; 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 

 prajocular, 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 entei-ing 

 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 



