80 
Annals of the Transvaal Museum. 
hinder part of the head intermixed with large round keeled tubercles ; 
naso-rostrals in contact (sometimes separated in young or half-grown 
individuals) ; tail annulate, with alternating smooth scales and large 
feebly keeled tubercles or scales ; five to six subdigital lamellae. Pale 
above, with dark-brown and whitish variegations ; a dark-brown streak 
on each side of the head, passing through the eye. P. capensis Smith. 
Similar to capensis, but differing in that naso-rostrals are not in 
contact ; the first labial is pentagonal, as high or higher than broad, and 
it borders the nostril ; the dorsal tubercles are arranged in more or less 
longitudinal rows, the scales of median row less convex and weaker-keeled 
than those laterally situated. Pale above, with five or six dark stripes 
across the back. P. weberi Roux. 
Four to five subdigital lamellae ; enlarged dorsal tubercles, rather 
small, keeled, but not symmetrically arranged ; the interocular region and 
back of the head with only a few scattered, slightly enlarged granules ; 
naso-rostrals separated by a granule ; mental longer than broad. Pale 
above, irregularly spotted all over with dark-brown (affinis), or four broad 
brown transverse bars on the back, and a broad brown crescent-shaped 
band, bordering the head posteriorly (formosus s. st.). P. formosus Smith. 
Four subdigital lamellae ; dorsal tubercles feebly keeled and 
irregularly arranged ; naso-rostrals separated ; mental square, not 
narrowed posteriorly ; outer part of femur and tibia with scattered oval 
strongly keeled large tubercles. Reddish-brown above ; the back with five 
transverse, dentated, whitish, dark-brown - edged bands, much narrower 
than the interspaces between them. P. mentomarginatus Smith. 
Dorsal tubercles conical or subconical. 
Head covered with conical tubercles and small granules ; body 
dorsally with small granules and large conical spinose tubercles, irregularly 
arranged; lower surfaces with granular subconical scales; naso-rostrals 
separated by a granule ; four or five subdigital lamellae. Greyish-brown 
above, with four transverse dentated whitish bars on the back, which are 
narrower than the intervals ; a whitish band from the mouth to the 
anterior crossbars. P. rugosus Smith. 
Head scales smooth, flattened, not conical ; dorsal surface of body 
with keeled subconical or conical tubercles and small granules ; ventrally 
with smooth, flat, imbricated scales ; naso-rostrals in contact ; four or five 
subdigital lamellae. Head pale, bordered by a black band starting from 
the nostril, passing through the eye and round the occiput ; this dark band 
bordered posteriorly by a pale one ; the body is dark with two pale bands 
dorsally. P. oshaugknessyi Boul. 
Dorsal tubercles distinct from granules only by their larger size. 
A few conical tubercles on outer side of tibia ; naso-rostrals rather 
widely separated ; three or four subdigital lamellae. A broad dark-brown 
streak on the side of the head, passing through the eve and converging 
in a curve towards its fellow on the occiput ; back with four longitudinal 
series of dark-brown spots, sometimes confluent into bands. 
P, maculatus Gray, 
