92 



C0LTJBE1DJ5. 



Maxillary teeth 20 to 25, posterior longest ; mandibular teeth 

 subequal. Head more or less elongate, distinct from neck ; eye 

 large or rather large, with round pupil. Body cylindrical ; scales 

 smooth, with apical pits, in 15 rows, disposed obliquely, at least on 

 the anterior part of the body ; ventrals rounded or more or less 

 distinctly keeled on each side, the keel not extending to the sub- 

 caudals. Tail long or rather long ; subcaudals in two rows. 



Tropical and South Africa. 



Synopsis of the Species. 



I. No trace of ventral keels. 



Three labials (fourth, fifth, and sixth) 



entering the eye ; subcaudals 111-122. 1. emini, p. 92. 

 Three labials (third, fourth, and fifth) 



entering the eye ; subcaudals 85-99 . . 2. ornatus, p. 93. 

 Two labials entering the eye ; subcaudals 



85-105 3. lioplogasUr, p. 93. 



II. Ventrals more or less distinctly keeled on the sides. 



A. Anal divided (rarely entire). 



1. Two labials entering the ej'e. 

 Fourth and fifth labials entering the eye ; 



a single anterior temporal ; subcaudals 



77-114 4. necjlectus, p. 94. 



Fourth and fifth labials entering the eye ; 

 usuall}' two superposed anterior tem- 

 porals ; subcaudals 114-124 5. natalensis, p. 94. 



Fifth and sixth labials entering the eye ; 



subcaudals 90-100 6. angolensis, p. 95. 



2. Three labials entering the eye. 



Ventrals 175-190 ; subcaiidals 115-135 ; 



temporals 1 + 1 ; body very slender 



anteriorly 7. Tteterolepidohis, p. 95. 



Ventrals 150-182; subcaudals 94-133; 



temporals usually 1+2 8. irregidaris, p. 96. 



B. Anal entire ; subcaudals 78-92 ; three labials entering the 



eye 9. heterodermus^ p. 97. 



1. Chlorophis emini. (Plate V. fig. 1.) 



Ahsetulla irregularis, part., Giinth. Ann. ^ Mag. N. H. (3) xi. 1863, 



p. 285. 

 emini, Giinth. Ann. ^ Mag. N. H. (6) i. 1888, p. 325. 



Rostral a little broader than deep, the portion visible from above 

 measuring one thiid its distance from the frontal ; iuteruasals a 

 little shorter than the prsefrontals ; frontal once and a half to once 

 and two thirds as long as broad, a little longer than its distance 

 from the end of the snout, a little shorter than the parietals ; loreal 



