134 
Annals of the Transvaal Museum. 
Rostral shield about twice as 
broad as deep : dorsal scales 
much smaller than ventrals : 
4 or 5 subdigital lamellae: 
snout at the most one and 
one-third as long as diameter 
of orbit 
Ab. Scales on snout? Like P. punc- 
tatus , except that snout is one 
and three-quarters as long as 
diameter of eye 
Ac. Scales on snout not much bigger 
than those on back of head. 
i. 4 to 5 subdigital lamellae: 
rostral shield not or only 
slightly broader than deep : 
naso-rostrals usually 
separated : snout a little longer 
than the diameter of eye 
ii. 5 to 6 subdigital lamellae : naso- 
rostrals separated • snout one 
and a half times the diameter 
of eye 
iii. 6 subdigital lamellae : naso- 
rostrals in contact : eye small, 
the snout being one and three- 
quarters times the diameter of 
eye 
3. P. punctatus , Pet. 
4. P. brunnthaleri, Wern.* 
5. P. ocellatus , Cuv. 
6. P. amoenus, Wern. 
7. P. served , Wern. 
2. Dorsal lepidosis heterogeneous, some of the scales being enlarged into 
tubercles. 
A. Tubercles small, distinguished from 
the granules only by their larger 
size, sometimes conical. 
3 or 4 subdigital lamellae : naso- 
rostrals widely separated: tibia with 
conical tubercles 8. P. macidatus , Gray. 
B. Tubercles larger than in the pre- 
ceding species, conical, subconical, 
keeled, or smooth. 
a. Scales on the head not very finely 
granular. 
Act. Ventral scales granular, sub- 
conical. 
4 to 5 subdigital lamellae : naso- 
rostrals separated : dorsal 
tubercles large, conical, spinose 9. P. rugosus , Smith. 
Ab. Ventral scales quite smooth and 
flat, imbricate. 
i. 4 to 9 subdigital lamellae (species 
of moderate size) : scales on 
middle of belly moderate, only 
a little smaller than those on 
sides of belly. 
* For remarks on this species see page 130. 
