Annals op the Tkansvaal Museum. 
33 
These last two and a still more doubtful specimen without precise 
locality constitute the only records with which I am acquainted from 
eastern Cape Colony, and from the evidence of these aberrant forms 
it is reasonable to expect that a collection of this species in the same 
region, an intermediate area between the home of true cordylus and 
that of true jonesii, would bring to light a series of intermediates 
between the two species. 
Zonurus jonesii is a small species, usually about 5 inches long, 
and rarely exceeding 5J inches in length. 
The South African species of Zonurus may be recognized by the 
aid of the following key: — 
1. Frontonasal in contact with the rostral. 2. 
Frontonasal separated from the rostral.- 3. 
2. Head with large spines posteriorly, the dorsal surface 
(excluding the flanks) with 23-25 transverse rows of scales, 
about 12 in a row' ... ... ... Z. giganteus Smith 
Head with short spines posteriorly ; dorsal surface wdth about 
- 40 transverse rows of about 20 shields... Z. warreni Boul. 
3. Flanks granular, about .10 scales in each transverse row 
dorsallv and 8 scales in each ventral row Z. capensis Smith 
Flanks not granular, having scales more or less like the 
, dorsals ... ... ... ... ... ... ... 4 
4. A supranasal present, nasal very small, low'er eyelid with a 
transparent disk ... ... ... ... ... ... 5 
Ho supranasal, nasal of moderate size, lower eyelid opaque 6 
5. Dorsally 32-44 transverse series of scales from occiput to base 
of tail, the largest row containing 32-38 scales ; anterior 
gular scales flat, moderate... ... Z. polyzonus Smith 
31 or 32 transverse rows of scales dorsally ; anterior gular 
scales almost granular ... ... Z. pustulatus Pet. 
6. Hasal swollen, hemispherical, pierced in the centre; temporal 
spines present ; dorsal scales in 15 or 16 transverse rows 
Z. cataphractus Boie 
Hasal not swollen, no temporal spines. T. 
7. Scales of the second row' immediately posterior to the 
parietals longitudinally elongated ; median suture of nasals 
long ... ... ... ... ... Z. vittifer Beich 
Scales of the second row immediately posterior to the parietals 
not longitudinally elongated. 8. 
8. Head depressed and laterally expanded in the temporal region, 
the greatest breadth being almost equal to the length of 
the head (from tip of snout to parietals) ; frontonasal 
transversely elongated ; lateral scales as large as the 
dorsals and strongly imbricate ; dorsals in 27 to 29 trans- 
verse rows ... ... ... ... ...Z. cordylus L. 
Head not much depressed and not much expanded in the 
temporal region, the scutes all finely and reticulately 
ribbed ; lateral scales smaller than dorsals and separated 
from each other by granular intervals ; dorsals in 23 to 26 
transverse rows ... ... ... ...Z. jonesii Boul 
* This character is not absolutely reliable : in jonesii , and I believe also in cordylus , a 
mall p ercentage of the individuals has the frontonasal in contact with the rostral. 
