198. POLEMON. 253 



labial forming a suture with its fellow behind the symphysial ; 

 three lower labials in contact with the anterior chin-shields, which 

 are a little longer than the posterior. Scales in 15 rows. Ventrals 

 181-200 ; anal divided ; subcaudals 14-18. Pale brown above, 

 with two series of round black spots, which may be light-edged ; 

 upper surface of head, a nuchal collar, and upper surface of tail 

 black ; ventrals, subcaudals, and terminal caudal shield white. 



Total length 317 mUlim. ; tail 29. 



"West Africa (Cameroon, Congo). 



5. Miodon neuwiedii. 



Microsoma neuwiedi, Jan, Rev. 8r Mag. Zool. (2) x. 1858, p. 519, & 



xi. 1859, pi. iv. 

 Elapomorphus (Urobelus) neuwiedi, Jan, Icon. G6n. 15, pi. i. fig. 2 



(1866). 



Diameter of eye less than its distance from the oral margin. 

 Rostral a little broader than deep, just visible from above ; inter- 

 nasals shorter than the praefrontals ; frontal nearly twice as broad 

 as the supraocular, as long as broad, as long as its distance from 

 the rostral, much shorter than the parietals ; nasal entire, in contact 

 with the single praeocular ; one postocular ; temporals 1 + 1 ; seven 

 upper labials, third and fourth entering the eye ; first lower labial 

 forming a suture with its fellow behind the symphysial; three 

 lower labials in contact with the anterior chin-shields, which are 

 nearly as long as the posterior. Scales in 15 rows. Ventrals 

 238 ; anal divided ; subcaudals 21. Pale brown above, with three 

 black longitudinal lines ; upper surface of head and base of tail 

 black ; lower parts white. 



Total length 172 millim. ; tail 10. 



Guinea (Christiansburg). 



198. POLEMON. 



Polemon, Jan, Rev. ^ Mag. Zool. (2) x. 1858, p. 520, and Elenco 

 sist. Ofid. p. Ill (1863) ; Reters, Mon. Berl Ac. 1863, p. 368. 



Maxillary very short, with three small teeth followed, after an 

 interspace, by a very large grooved fang situated in advance of the 

 eye; third and fourth mandibular teeth large, fang-Hke. Head 

 small, not distinct from neck; eye minute, with round pupil; 

 nostril in a divided nasal, which does not touch the rostral, the 

 intemasal forming a suture with the first labial ; no loreal ; parietal 

 narrowly in contact with a labial. Body cylindrical; scales 

 smooth, without pits, in 15 rows ; ventrals rounded. Tail very 

 short ; subcaudals single. 



West Africa. 



