806 VAEANID^. 



IV. Nostril round ; tail round or slightly compressed posteriorly. 



A. A median series of transversely dilated supraoculars. 



Nuchal scales not keeled 22. prasi.ms, 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. punctatiis, p. 322. 

 Caudal scales not spinose ; nostril equally 



distant from the orbit and the end of 



the snout ; 65 to 75 rows of ventral 



scales 25. timorensis, p. 323. 



Upper and lateral caudal scales strongly 



spinose 26. acanthurus, p. 324. 



2. Dorsal scales nearly as broad as 



long 27. caudolineatus,i^.d24. 



1. Varanus griseus. 



Psammosaurus scincus, Gray, Cat. p. 7. 

 Psammosaurus ? caspicus, Gray, I. c. 

 Tupinambis griseus, Daud. Hept. viii. p. 352. 



areuarius, Geoffr. Descr. JEyypte, Rept. p. 123, pi. iii. fig. 2, pi. vi. 



figs. 14-15. 

 Varanus scincus, Merr. Tent. p. 59. 



Psammosaurus griseus, Fitzing. N. Class. Kept. p. 50 ; Eiclno. Nouv. 

 Mem. Soc. Nat. Mosc. ix. 1851, p. 416. 



caspius, Eichw. Zool. Spec. iii. p. 190, and Faun. Casp.-Cauc. 



p. 48, pis. vii.-ix. 



scincus, Wagl. Syst. AmpJi. p. 165 ; Jerdon, Proc. As. Soc. 



Bemj. 1870, p. 70. 

 Monitor scincus, Gray, Griff. A. K. ix. Syn. p. 27 ; Schley. Abbild. 



p. 69. 

 Vai'anus arenarius, Du7n. Sr Bibr. iii. p. 471; Guiclien. Expl. Sc. 



Alyer., Zool. v. p. 6 ; De Fdippi, Viag. Pers. p. 352. 

 oruatus {non Daud., non Gray), Carlleyle, Journ. As. Soc. 



Beng. xxxviii. 1869, p. 192. 

 Monitor griseus, Peters, Mon. Bert. 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 



