XENOSAURIDjE. ZONtrKIDi. 251 



of three or four transversely dilated scales on the supraocular 

 region ; nostril pierced in a single nasal ; rostral quadrangular, 

 low, three times as broad as high ; ten to thirteen upper and nine 

 or ten lower labials ; mental short and broad, subtriangular or sub- 

 pentagonal ; two or three rows of enlarged scales bordering the 

 lower labials ; gular region granular. Two strong transverse gular 

 folds. Body depressed, covered above with irregular minute 

 granules intermixed with small round or oval, conical or obtusely 

 keeled tubercles forming irregular longitudinal series ; a more or 

 less distinct fold from axilla to groin, lielly covered with smooth 

 squarish scales forming thirty-six transverse series (from fore arm 

 to proeanal region) ; a transverse series in the middle of the belly 

 contains about twenty scales. Limbs covered above with granules 

 and tubercles as on the body, inferiorly with uniform granules ; 

 digits slender, cylindrical, slightly swollen at the articulations, in- 

 feriorly with a series of transverse smooth scales. Tail cj'lindrical, 

 tapering, about as long as head and body, with cross rows of 

 subtubercular scales above, of larger quadrangular flat ones in- 

 feriorly. Yellowish-brown, marbled with blackish, with four or 

 five more or less marked transverse light bands on the back, and 

 dark and light aunidi on the tail. 



iiiillim. millim. 



Total length 240 Pore limb 45 



Head 30 Hind limb 57 



Width of head .... 24 Tail 120 



Body 90 



Southern Mexico. 



a-c. Ad. Cordova. M. Sall6 



d. Ad. Oaxaca. M. Salle 



C. 



c. 



(Types.) 



Fam. 8. ZONURIDiE. 



Cordyloidea, part., Fitzinc/er, Neue Classif. Sept. 1826. 



Autarchoglossas, part., Wagler, Si/st. Amph. 1830. 



Chamsesauri, part., Ptychopleuri, part., Wiegmann, Herp. Mex. 



1834. 

 Chakidiens, part., Dumeril 8f Bihron, Erp. Gen. v. 1839. 

 Zonuridfe, part., Chama;sauridai, Oray^ Cat. Liz. 1845. 

 Zonurida;, part., C'o/ie, I'roc. Am. Asuoc. Ado. Sc. xix. 1871. 

 Zouuridaj, Boulemjer, Ann. i^- Mag. N. H. (5) xiv. 1884. 



Tongue short, villose, scarcely protractile, entire or very feebly 

 nicked at the end. Dentition pleurodont ; teeth numerous, small, 

 with long cylindrical shafts, hollowed out at the base. Palate 

 toothless. Bostorbital and frontos(]uamosal arches bony ; supra- 



