292 CLASS xv. 



Sp. Gerrhonotus rudicollis WIEGMANN Herpetol. mexic. Tab. x. fig. i ; 

 Gerrhonotus Deppli WIEGM. 1. 1. Tab. IX. fig. 3 ; this last-named species 

 has large dorsal scales not carinate. All the species are from America ; 

 the greatest number from Mexico. 



Gerrhosaurus WIEGM. Maxillary teeth subulate, palatine 

 conical, many. Four feet pentadactylous, with toes slender. 

 Femoral pores. Membrane of tympanum open, depressed ; anterior 

 margin of auditory aperture furnished with a lunate scute. Longi- 

 tudinal furrow on both sides, produced as far as hind feet. Tail 

 long, verticillate, unarmed. 



Sp. Gerrhosaurus bifasciatus DUM., BIBR. Erpet. PL 47; Gerrhosaurus 

 lineatus COCTEAU, GUERIN Magas. de Zool. 1833, Kept. PI. 5, 6; these 

 species are from Madagascar ; some others are known from South Africa, 

 as Gerrhosaurus sepifomnis, which was referred by SCHNEIDER and MERREM 

 to the genus Scincus. 



Zonurus MERR., Gordylus GRONOV. Maxillary teeth subulate, 

 equal, obtuse at the apex. Tongue oblong and triangular, emargi- 

 nate at the apex, beset with filiform papillae. Head triangular, flat 

 above, declivous at the sides. Aperture of ears large, covered 

 anteriorly by the exsert side of occiput. Four feet pentadactylous. 

 Femoral pores in all, sometimes in a double row. Caudal scales 

 carinate, with carina produced posteriorly into a strong spine. 

 Longitudinal furrow on both sides. Abdominal scales quadrangular, 

 flat, smooth. 



Sp. Zonurus griseus DUM., BIBR., Lacerta cordylus L., SEBA Thesaur. i. Tab. 

 109, fig. 5 (tail monstrous, bifid); 11. Tab. 62, fig. 3, Zonurus cordylus 

 MERR. Beitr. in. Taf. vn. The scales of the back in this species form 

 rings which correspond with those of the belly; on the other hand, they 

 are much larger in Zonurus cataphractus GRAY (differing also in other 

 characters), so that one row of dorsal scales corresponds to two rows 

 of ventral scales. Zonurus microlepidotus GRAY, Cordylus tnicrolepidotus 

 Cuv., GUERIN Iconogr., Rept. PI. 6, fig. i, is distinguished by small 

 tubercular dorsal scales. All these species are from South Africa. 



Tribolonotus DUM., BIBR. Maxillary teeth equal, subulate. 

 Tongue beset with scaly papillae. Head flat above, declivous 

 posteriorly ; neck constricted, depressed. Membrane of tympanum 

 naked, behind the angle of mouth. Osseous scutes, armed with 

 a strong reclined spine, covering back and tail. Scales of abdomen 

 transverse, imbricate. .Sides of body rugose, without longitudinal 



