806 VARANIDZE. 
IV. Nostril round ; tail round or slightly compressed posteriorly. 
A. A median series of transversely dilated supraoculars. 
Nuchal scales not keeled.............. 22. prasinus, p. 321. 
Nuchal scales strongly keeled .......... 23. kordensis, p. 322. 
B. Supraocular scales subequal. 
1. Dorsal scales much longer than broad. 
Upper caudal scales not spinose; nostril 
slightly nearer the end of the snout 
than the orbit; 85 to 95 rows of ven- 
tral scales from collar-fold to groin ., 24. punctatus, p. 322. 
Caudal scales not spinose ; nostril equally 
distant from the orbit and the end of 
the snout; 65 to 75 rows of ventral 
BCAIESs fi Rasa trace wemretnae rata Maw ea 25. timorensis, p. 323. 
Upper and lateral caudal scales strongly 
SPRMOSO: 25 pAnassis iets. ne tiea.se? de aaluatatatae ath 26. acanthurus, p. 324. 
2. Dorsal scales nearly as broad as 
LONE Maas hab eee haw 27. caudolineatus,p.324. 
1. Varanus griseus. 
Psammosaurus scincus, Gray, Cat. p, 7. 
Psammosaurus ? caspicus, Gray, @. c. 
Tupinambis griseus, Daud. Rept. viii. p. 352. 
arenarius, Geoff. Deser. Egypte, Rept. p. 123, pl. iii. fig. 2, pl. vi. 
figs, 14-15. 
Varanus scincus, Merr. Tent. p. 59. 
Psammosauwus griseus, Fitzing. N. Class. Rept. p.50; Eichw. Nouv. 
Mém. Soc. Nat. Mosc. ix. 1851, p. 416. 
caspius, Eichw, Zool, Spec, iil. p. 190, and Faun. Casp-Caue. 
p. 48, pls. vii.ix. 
scincus, Wagl. Syst. Amph. p. 165; Jerdon, Proc. As. Soc. 
Beng. 1870, p. 70. 
Monitor scineus, Gray, Griff. A. K. ix. Syn. p. 27; Schleg. Abbild. 
. 69. 
ais arenarius, Dum. § Bibr. iii. p. 471; Guichen. Expl. Se. 
Algér., Zool. v. p. 6; De Filippi, Viag. Pers. p. 352. 
ornatus (non Daud., non Gray), Carlleyle, Journ. As. Soc. 
Beng. ¥xxviii. 1869, p. 192. 
Monitor griseus, Peters, Mon. Berl. Ac, 1870, p. 109. 
Teeth acute, compressed. Snout depressed at the end, measuring 
the distance from the anterior border of the orbit to the anterior 
border of the ear; canthus rostralis distinct. Nostril an oblique 
slit, about four times as distant from the end of the snout as from 
the orbit. Digits rather short. Tail round or slightly compressed. 
Scales of head, including supraoculars, very small, granular, sub- 
equal. Scales on upper surfaces small, smooth or feebly keeled ; 
those on the sides of the neck generally conical in adult specimens. 
Abdominal scales smooth, in one hundred and ten to one hundred 
