THE RKPTILE BOOK 



I'LATK XXXVI11 



HvturuoKia propi,iqua and Callisaurus draconoides. From above and beneath these small lizards appear very similar. The species of 

 Holbrookia, however, may be immediately recognised by the absence of an ear-opening 



Collared Lizard, Crotaphytus collaris female. Note the 

 narrow collar, as compared with the markings of a male 

 specimen, on another plate 



Desert Iguana, Dipsosaurus dorsalis. The row of enlarged 

 the back represents the crest of the tropical iguanas 



STRUCTURAL CHARACTERS OF NORTH AMERICAN LIZARDS, Iguanidae 



