198. PorEMON. 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 millim. ; tail 29. 
West Africa (Cameroon, Congo). 
5. Miodon neuwiedii. 
Microsoma neuwiedi, Jan, Rev. § Mag. Zool. (2) x. 1858, p, 519, & 
xi. 1859, pl. iv. 
Elapomorphus (Urobelus) neuwiedi, Jan, Icon. G'én. 15, pl. 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 prefrontals ; 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 preocular ; 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. 111 (1863) ; Peters, 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-like. Head 
small, not distinct from neck; eye minute, with round pupil; 
nostril in a divided nasal, which does not touch the rostral, the 
internasal 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. 
