1. T\CnTDROMUS. 3 



B. Nostril well separated from the labials. 



1. Lower eyelid scaly or with a small transparent disk. 



a. Diiiits smootli or indistinctly keeled inferiorly, not fringed 

 laterally. 



Collar well marked ; ventral plates keeled. 



3. Gastropholis, p. 7. 



Collar absent ; dorsal scales large, imbricate, strongly keeled, 



7. Tropidosaura, p. 50. 



Collar well marked ; dorsal scales small ; ventral plates smooth. 



8. Nucras, p. 52, 



h. Digits distinctly keeled inferiorly, not fringed laterally. 



Collar absent ; dorsal scales large, imbricate, strongly keeled. 



13, Ichnotropis, p. 78. 



Collar more or less distinct ; dorsal scales small. 



14. Eremias, p. 80. 



c. Digits fringed laterally. 



Femoral pores 15 Scapteira, p. 107. 



No femoral pores 16. Aporosaura, p. 117. 



2. Lower eyelid with a very large transparent disk covering 

 nearly entirely the eye; digits strongly keeled infe- 

 riorly. 



Lower eyelid movable .... 11. Cabrita, p. 69. 



Lower eyelid united with the upper . 12. Ophiops, p. 72. 



II. No frontoparietals ; tail much depressed and denticulated late- 

 rally 17. Holaspis, p, 118. 



1, TACHYDROMUS. 



Tachydromus, Baud. Rept. ill. p. 251 ; Wagler, Syst. Amph. p. 157 ; 



Wiegm. Herp. Mex. p. 10 : Dum. c^ Bihr. v. p. 155 ; Gray, Cat. 



Liz. p. 52 ; Giinth. Rept. Brit. Ind. p. 69 ; Lataste, Ann. Mus. 



Genov. (2) ii. 1885, p. 125. 

 Tachysaurus, Gray, I, c. 



Head-shields normal *. Nostril pierced between two nasals and 

 the first labial. Lower eyelid scaly. Collar more or less distinct. 

 Back covered with large, rhomboidal, keeled shields forming longi- 



* I. e. n frontonasal, a pair of prisefrontals, a frontal, a pair of frontoparietals, 

 a pair of parietals, an interparietal, and an occipital. 



B 2 



