1. VARANUS. 306 
B. Abdominal scales keeled. 
1. Nostril equally distant from the 
orbit and the end of the snout.. 8. grayi, p. 312. 
2. Nostril much nearer the orbit than the end of the snout. 
Snout moderate ; dorsal scales large ; nu- 
chals not keeled ....... 0.0... cee 9. dumerilii, p. 312. 
Snout very long, pointed; nuchal scales 
extremely large and strongly keeled .. 10. rudicollis, p. 313. 
3. Nostril much nearer the end of the 
snout than the orbit.......... 11. salvadorii, p. 314. 
III. Nostril round or oval; tail compressed, keeled above. 
A. A transversely dilated median series of supraocular scales. 
1. Nostril oval, at least twice as far from the orbit as from the 
end of the snout. 
a. More than 80 transverse rows of abdominal scales from 
gular fold to groin. 
a. Nuchal scales not larger than 
dorsals: .aiciwase oe ees g 12. salvator, p. 314. 
B. Nuchal scales larger than dorsals. 
Nuchal scales larger than occipitals .... 18. nuchalis, p. 315, 
Nuchal scales smaller than occipitals .... 14. cumingii, p. 316. 
b. Less than 80 rows of scales 
from gular fold to groin .... 15. togianus, p. 316. 
2. Nostril round. 
Nostril considerably nearer the end of the 
snout than the orbit; nuchal scales 
very small, keeled, separated by very 
wide interspaces .........eee ee eae 16. kalabeck, p. 316. 
Nostril a little nearer the end of the snout 
than the orbit: 2. aeus ss heeu wwe bees 17. indicus, p. 316, 
B. Supraocular scales subequal. 
1. Nostril a little nearer the orbit 
than the end of the snout .... 18. niloticus, p. 317. 
2. Nostril nearer the end of the snout than the orbit. 
Nostril twice as far from the orbit as from 
the end of the snout; scales on upper 
surface of head larger than temporals.. 19. vartus, p. 319. 
Nostril more than twice as far from the 
orbit as from the end of the snout; 
head-scales very small.............. 20. giganteus, p. 320, 
Nostril a little nearer the end of the snout 
than the orbit ; head-scales very small. 21. gouldii, p. 320. 
VOL. Il. x 
