154. oxyRHOPUS. 99 
Total length 640 millim.; tail 160. 
East and Central Africa. 
a, Hgr. (V. 195; C. 81). Zambesi. Sir J. Kirk [C.}. 
i 
3g (V. 190; C, 95). Lake Tanganyika. Sir J. Kirk [C.]. 
154. OXYRHOPUS. 
Pseudoboa, part., Schneid. Hist. i ii, p. 281 (1801). 
Scytale (mon Latr.), part., Merr. Tent. p. 90 (1820); Fitzing. N. 
Class. Rept. p. 29 (1826). 
i. 
Lycodon, part., Schleg. Phys. Serp. ii. p. 104 (1837). 
Coluber, part., Schleg. t. c. p. 125. 
Sphenocephalus, Fitzing. in Tschudi, Faun. Per., Herp. p. 48 (1846), 
Siphlophis, Fizng. 1. c. p. 56. 
Rhinosimus (non Latr.), Dum. § Bibr. t.c. p. 991; Giinth. 1. ce. p. 10. 
Brachyruton, Dum. § Bibr, t.c. p. 1002; Jan, lc. p. 91. 
Olisthenes, Cope, Proc. Ac. Philad. 1859, p. 296. 
Phimophis, Cope, Proc. Ac. Philad. 1860, p. 79. 
Maxillary teeth 10 to 15, subequal, followed, after an interspace, 
‘by a pair of moderately enlarged grooved teeth situated just behind 
the vertical of the posterior border of the eye; anterior mandibular 
teeth longest. Head distinct from neck; eye moderate or rather 
small, with vertically elliptic pupil. Body cylindrical or feebly com- 
pressed ; scales smooth, with apical pits, in 17 or 19 rows; ventrals 
rounded or obtusely angulate laterally. Tail moderate or rather 
long; subcaudals single or in two rows. 
Central and South America. 
Synopsis of the Species. 
I. Subcaudals in two rows. 
A. Normally eight upper labials; preocular reaching the upper 
surface of the head. 
1. Preocular in contact with, or, exceptionally, narrowly sepa- 
rated from the frontal; ventrals 174-225. 
a. Black cross-bars, if present, not disposed in threes. 
Eye moderate; subcaudals 78-126 .... 1. petolarius, p. 101. 
Eye rather small; subcaudals47-80 .. 2. rhombifer, p. 103. 
6. Black cross bars, if present, disposed in threes. 
Snout rather prominent ; subcaudals 55- 
3. trigeminus, p. 104. 
Snout not prominent; subcaudals 76-89. 4. bitorquatus, p. 104, 
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