246 



COLTJBRID*. 



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

 above nearly as long as its distance from the frontal ; internasals 

 much broader than long, much shorter than the prsefrontals ; 

 frontal once and a half to once and two thirds as long as broad, 

 longer than its distance from the end of the snout, shorter than 

 the parietals ; supraocular small ; nasal divided or semidivided ; 

 a very small postocular, sometimes fused with the supraocular; 

 a single temporal; six upper labials, third in contact with the 

 prsefrontal, third and fourth entering the eye, fifth largest and 

 in contact with the parietal ; four lower labials in contact with 

 the anterior chin-shields, fourth very large and narrowly separated 

 from its fellow by the posterior chin-shields. Scales in 17 rows. 

 Ventrals 173-208; anal divided; subeaudals 21-38. Uniform 

 blackish brown. 



Total length 365 millim. ; tail 27. 



West Africa. 



a. S (V. 182 ; 0. 34). Sierra Leone. 



h. S (V. 173 ; 0. 33). Niger. J. W. Crosse, Esq. [P.]. 



c. ? (V.208; C.21). W. Africa. 



2. Calamelaps polylepis. 



Calamelaps polylepis, Bocage. Jorn. So. Lisb. iv. 1873, p. 216, and 



Serp. Angola, p. 126, pi. ix. %. 2 (1895). 

 miolepis, Giinth. Ann. 8f Mag. N. H. (6) i. 1888, p. 323. 



In every respect like O. unicolor, except that the scales are in 

 21 rows. Ventrals 163-212; subeaudals 16-27. 

 Total length 400 miUim. ; tail 23. 

 Angola, Nyassaland. 



a. $ (V. 208 ; C. 18). Cape MoLear, Lake A. A. Simons, Esq. [C.]. 

 Kyassa. (Type of C miolepis.) 



3. Calamelaps? concolor. 



Cho.istodon concolor, Smith, III. Zool. S. Afr., Sept., App. p. 18 

 (1849). 



Rostral triangular; internasals small; frontal subrhomboidal, 

 the hinder portion most prolonged ; supraocular very small, sub- 

 triangular, forming the supero-posterior border of the eye ; post- 

 ocular very small ; third and fourth upper labials entering the eye; 

 two pairs of narrow chin-shields, the second pair longest. Scales 

 in 13 rows. Ventrals 134 ; subeaudals 38. Greenish black above, 

 with purple gloss ; pale blackish purple beneath, the shields mar- 

 gined behind with livid white. 



Total length 190 millim. ; tail 28. 



Caffraria. 



