334 TEUDJE. 



Dorsal scales smooth or striated, juxtaposed, separated from ventrals 

 by a fold; collar-fold strong .... 26, Proctoporus, p. 412. 



III. Nostril pierced between the nasal and the first labial ; no ear- 

 opening. 



A. Digits rudimentary or absent. 



Digits distinct, clawed ; a pair of praefrontals and a frontonasal. 



27. Scolecosaurus, p. 416. 



Digits, if distinct, clawless ; a frontonasal ; no prsefrontals. 



28. Cophias, p. 417. 



No frontonasal, no praefrontals .... 29. OpMognomon, p. 420. 



B. Digits well developed ; inner finger rudimentary. 



Dorsal scales narrow, hexagonal-lanceolate, keeled. 



30. Heterodactylus, p. 422. 



IV. Nasal plates widely separated by a frontonasal ; ear exposed ; 

 inner finger, if distinct, clawless. 



A. Eyelids developed. 



Dorsal scales narrow, hexagonal-lanceolate, keeled. 



31. Perodactylus, p. 423. 



All the scales rounded, imbricate, two median dorsal and two ven- 

 tral series strongly enlarged transversely. 



32. Iphisa, p. 424. 



All the scales rounded, imbricate, subeqnal. 



33. Tretioscincus, p. 425. 



B. No eyelids ; scales cycloid, quincuncial. 



No pri3efrontals ; frontoparietals present. 



34. Micrablepharus, p. 426. 



Praefrontals present ; no frontoparietals. 



35. Gymnophthalmus, p. 427. 



1. TUPINAMBIS. 



Tupinambis, part., Daud. Rept. iii. p. 6. 



Sauvegardes, part., Cuv. R. A. ii. p. 26. 



Teius, part., Merr. Tent. Si/st. A^nph. p. 60. 



Monitor, Fitzing. N. Classif. Rept. p. 21. 



Exypnestes, Kemp, Isis, 1826, p. 87. 



Podinema, Wae/l. Syst. Amph. p. 153; Wiegm. Herp. Mex. p. 8. 



Ctenodon, Wagl. I. c. ; Wiegm. I. c. 



