14 REPTILES, 



Fara. II. Caltetepons, (Helodermid^). 



The head depressed, covered with many-sided subequal convex 

 shields ; muzzle rounded ; rostral, uasal, and front labial plates 

 thin, flat ; teeth on the inner side of the jaws, incurved, with a 

 groove on the front of the inner side. Femoral pores none. Tongue 



? The back and sides with oblong, 6-sided, very convex, 



shield-like scales. The belly with oblong, rather convex plates. 

 Tail round, with oblong, convex scales above, and flat, elongate, 

 thin plates beneath. Legs 4, strong; toes 5-5 ; claws curved. 



1, Heloderma, Weigm. Trachyderma, Wagler. * 



The Caltetepon. Heloderma horridum, Weigm. his, 1829, 

 627, H. M. t. 1 . Wagl Icon. 1. 18. Schinz, Rept. t. 33,/. 1. Dum. 

 et Bib. E. G. iii. 499, t. 36, bad. De Caltetepon, Hernand, H. 

 N. Hisp. 315. 



Brown, yellow-spotted. ^ . 



a. Half-grown. Mexico. 



h. Adult, Mexico. Presented by Dr. John Richardson. 



B. Head with large regular shields. Tongue mostly free at the base. 



* Sides Jlattish, granular. 



Fam. III. Teguexins, (Teid^). 



Head pyramidical, covered with regular many-sided shields ; 

 supraorbital plate horny ; teeth solid, rooted ; tongue elongate, 

 flat, free (rarely slightly sheathed at the base). Scales of the back 

 granular or keeled, rhombic. Sides flat, covered with small gra- 

 nular scales. Throat scaly, with a double collar, rarely indistinct. 

 The New or Western world, 



