138 COLUBRID. 
166. TRIMERORHINUS. 
Coronella, part., Schleg. Phys. Serp. ii. p. 50 (1887). 
etonerortti=ae, ‘Smith, Ill. Zool. S. Afr., Rept. (1847). 
Dipsas, part., Dum. § Bibr. Erp. Gén. vii. p. 1133 (1854). 
Psammophylax, Giinth. Cat. Col. Sn. P. 31 (1858). 
Psammophylax, part., Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 309. 
Maxillary teeth 10 to 12, subequal, followed, after an interspace, 
by a pair of enlarged grooved fangs, situated below the posterior 
border of the eye; anterior mandibular teeth strongly enlarged. 
Head distinct from neck ; eye moderate, with round pupil; nostril 
crescentic, between two nasals and the internasal. Body cylin- 
drical; scales smooth, with apical pits, in 17 rows; ventrals 
rounded. ‘Tail moderate ; subcaudals in two rows. 
Africa south of the Equator; East Africa. 
Synopsis of the Species. 
Rostral at least as deep as broad; eye as 
long as its distance from the nostril.... 1. rhombeatus, p. 188. 
Rostral as deep as broad ; eye shorter than 
its distance from the nostril .......... 2. triteniatus, p. 139. 
Rostral slightly broader than deep; eye 
shorter than its distance from the nostril. 3. variabilis, p. 140. 
1. Trimerorhinus rhombeatus. 
ar _ = pp- 17, 20, 84, pls. xv. fig. 2, xix. figs, 3 & 4, xxix. 
. 2 (1735). ; 
Coluber Eran Linn. Mus. Ad. Frid. p. 27, pl. xxiv. ne 
(1754), and S. N. 1. p. 380 (1766) ; Daud. Rept. vii. p. 119 (1803). 
Coronella tigrina, Laur, Syn. Rept. p. 87 (1768). 
Coluber tigrinus, Gmel. S. N. i. p. 1113 (1788). 
Coronella rhombeata, Bote, Isis, 1827, p. 589; Schleg. Phys. Serp. ii. 
p. 70, pl. ii. figs. 14 & 15 (1837). 
Ceelopeltis rhombeata, Wagl. Icon. Amph. pl. xxxii. (1833). 
77, mem rhombeatus, Smith, Ili, Zool. S. Afr., Rept. pl. lvi. 
7). ; 
Dipsas rhombeata, Dum. § Bibr. vii. p. 1154 (1854). 
Psammophylax rhombeatus, Giinth. Cat. p. 31 (1858); Jan, Arch, 
“ioe Anat. Phys. ii. 1868, p. 309; Bocage, Herp. Angola, p. 108 
95). 
— ocellatus, Bocage, Jorn. Se. Lish. iv. 1873, p. 221. 
—— rhombeatus, var. trilineatus, Boetty. Ber. Offend. Ver. Nat. 
1883, p. 156. 7 
—— rhombeatus, var, biseriata, F’, Miill. Verh. Nat. Ges. Basel, x. 
1892, p. 202, 
Snout rather prominent, with obtusely angular canthus. Rostral 
very variable in shape, at least as deep as broad, frequently much 
deeper than broad, more or less deeply wedged in between the 
internasals, which it often entirely separates; frontal once and two 
thirds to twice as long as broad, as long as or longer than its 
distance from the end of the snout, usually longer than the parietals ; 
