( xxii ) 



Bisk ill-defined ... S. Beddoraei. 



Disk long. Scales on it with 3 — 4 keels ... S. ocellata. 

 Disk ill-defined, long. Scales on it with 3 — 



4 keels . . . S. Elliottii. 



Disk flat, with a terminal bicuspid scale. 



Scales black with a yellow margin ... S. bicatenata. 



Disk flat with a terminal bicuspid scale. 



Black with some white scales ... S. Shortii. 



Disk flat. Scales on it 2 keeled ... S brevis. 



Disk prominently 2 keeled, red blotches on 



the sides ... S. rubromaculata. 



Disk ill-defined. Black, brownish anteriorly S. Wood-Masoni. 



Plectrurus. 



The supraorbital and postocular distinct. Terminal scale of 



tail vertical. 

 Scales in 15 rows. Uniform brown ... P. Perrotetii. 



Scales in 15 rows. Purple above, yellow 



below ... P. Giintheri. 



Scales in 15 rows. Top of tail flattened 



vertically ... P. scabricauda. 



Scales in 15 rows. Caudal disk vertically 



compressed (laterally). Scales on it 3 — 5 



keeled ... P. Kanaricus. 



Scales in 15 rows. Terminal scale of disk, 



pustulose above, grooved below ... P. trilineatus. 



Scales in 17 rows. Black above, red below. P. sanguineus. 



Melanophedium. 



Scales of tail smooth. Tail ending in a horny point. 

 Terminal scale pointed. Black ... M. Wynaadense. 



Terminal scale pointed. Black, with lateral 



yellow stripe ... M. bilineatum. 



Terminal scale bicuspid. Black above, 



whitish below . . . M. punctatum. 



