Antals of the Transvaal Museum. 
103 
five carinate ; tympanic shield large, crescentic, or triangular. Blackish- 
brown above, each scale with a small yellow spot or short streak ; a yellowish 
dorso-lateral band sometimes present. G. vdlidus Smith. 
Twenty-two to twenty-four longitudinal series of scales dorsally ; 
ten longitudinal series of scales ventrally ; dorsal scales unicarinate ; 
fronto- nasal in contact with rostral and frontal ; tympanic shield large, 
crescentic. Brownish above, with squarish light spots ; a light dark- 
edged dorso-lateral streak. • G. typicus Smith. 
Similar to typicus, but differing thus : only eight longitudinal series 
of scales ventrally; fronto-nasal not meeting rostral nor the frontal; no 
pale dorso-lateral streak. G. auritus Btgr. 
Twenty to twenty-eight longitudinal series of scales dorsally ; ventrals 
in eight longitudinal series. Tympanic shield narrow, usually band-like, 
not much enlarged. Brown or olive above, with a pale dark-edged dorso- 
lateral streak. G. flavigularis Wieg. 
Tetradactylus. 
Limbs short, but well developed and pendactyl ; ventrals in eight 
longitudinal series ; nine to twelve femoral pores. Olive or reddish-brown 
above, the sides usually darker. T. seps L. 
Limbs very short, tetradactyl ; ventrals in six longitudinal series ; 
four or five femoral pores. Olive above, with dark-brown longitudinal 
streaks. T. tetradactylus Lacep. 
Limbs anteriorly two -fingered and cfawed ; posteriorly undivided and 
without claws ; ventrals in eight longitudinal series ; two femoral pores. 
Brown above ; a thin dark line from the eye to the fore limb, and another 
dark line starting from the shoulder and going the whole length of the body 
and tail. T. breyeri Boux. 
Limbs minute, undivided ; ventrals in six longitudinal series ; 
two or three femoral pores. Olive above, with dark-brown longitudinal 
lines. T. ajricanus Gray. 
CoRDYLOSAURUS. 
Dorsal scales three to five carinate, in fifteen longitudinal and fifty- 
two to fifty-five transverse series ; ventrals in eight longitudinal series. 
Pale-olive above, with three broad dark-brown longitudinal bands, which 
include a white dorso-lateral band on each side. C. trivittatus Pet. 
Similar, but the dorsal scales not distinctly keeled ; middle of the 
back yellowish-brown, more laterally checkered white and blackish-brown, 
the sides of the body dark-brown. C. subtessellatus Smith. 
Notes on the Specific Characters of Certain Species. 
Gerrhosaurus flavigularis Wieg. — In view of the great variability of 
the principal character on which the distinction between the two species 
was based, Tornier considers that G. flavigularis and G. nigiolineatus Hall 
are the same. Our series of G. flavigularis shows much variation in the 
relationship of the fronto-nasal to the neighbouring scutes ; it is always 
shut off from the rostral, but it may form a broad or only a very narrow 
