Mr. Gray on the Slender-tongued Sanrians. 393 



long, longitudinal in the middle between the apex of the muzzle and 

 the front angle of the eye ; tail elongate, compressed, with a double 

 edged keel above ; toes elongate, unequal, strong ; teeth rounded. 



* Scales small ; ventral shields small, twice as long as broad. 



Monitor Dracana. Lacerta Dracaena, Linn. Stellio Salveguardia, 

 Laur. Tupinambis Bengalensis and T. Indicus, Daud. 30. and T. 

 Cepedianus, Daud. t. 29. Uaranus guttatus, U. punctatus and U. 

 Argus, Merrem. Monitor gemmatus, Guerin, Icon, t 3. f. 1. 



India. 



** Scales moderate ; ventral shields square, as broad as long. 

 a. Scales on the eyebrows equal. 

 Monitor Niloticus. Polydaedalus, Nilot., Wagler. Lacerta capen- 

 sis, Sparman ? Tup. ornatus, Daud. 



Junior, Tup. elegans and T. stellatus, Daud. 

 Africa, North, South, and Western. 

 Monitor capensis. Lac. capensis, Sparman. 

 Jun. Monitor pulcher, Leach. 

 South and Western Africa. 



b. With a larger row of scales in the small scales over the eyebrows. 



Monitor heraldicus, Gray, Griffith's Anim. Kingd. 



India. Brit. Mus. 



Monitor nebulosus, Gray, Griffith's Anim. Kingd. ix. 27. Dum. 

 and Bib. iii. 433. Tup. neb. Cuv. MSS. 



India. 



Empagusia. Nostrils oblong, rather in the front of the muzzle. 

 Tail (shorter than the body and head) tapering, roundish, with a 

 double-edged keel above ; toes short, strong, subequal ; teeth 

 rounded; scales large. 



Empagusia flavescens. Monitor flavescens, Gray, Griffith's Anim. 

 Kingd. ix. 25. Uran. Russelii, Schlcgel, MSS. Uran. Piquotii, Dum. 

 and Bib. iii. 483.' 



India. 



Empagusia ocellata. Monitor ocellatus, V. Hey den, Ruppell Atlas, t. 



Dongola. 



Emp. albogularis. Tupinambis albogularis, Daud. iii. 72. t. 32. 

 Monitor Gillii, A. Smith, Zool. Journ. Brown, black-banded, with 

 a black streak on each side of the nape. Nostrils subposterior. 



South Africa. Brit. Mus. 



Hydrosaurus, Wagler. Tupinambis, Fitz. Nostrils near the apex 

 of the muzzle ; teeth compressed, sharp-edged, edge toothed ; tail 

 elongate, with a double-edged keel above ; toes unequal, elongate. 



