78 THE REPTILES OF THE GALAPAGOS ISLANDS. 



It is handsomely marked and bears a striking resembkance 

 to species of Enyalioides. Tliis is apparent even in the 

 gular sac and the transverse fold on the throat, and sug- 

 gests that in our systems these genera are placed too far 

 apart. The coloration differs materially from that of the 

 large specimens. The ground color is of a light olive, 

 lighter and uniform beneath and blotched and vermicuUite 

 on the back. Between the nape and the hips on the middle 

 of the dorsal surface there is a series of eight lighter cen- 

 tred, brownish transverse bands, and between these and 

 at their sides on the flank there are streaks forming vermi- 

 culations or rings. The rings enclose spaces of the ground 

 cok>r ; on the lower parts of the flanks they are larger and 

 more distinct, resembling in a measure those on the flank 

 of Enyalioides planiceps as figured by Guichenot. The 

 crown of the head bears scattered spots of black. The 

 tail is brown on the top ; on the middle of the side it has 

 a more or less broken longitudinal streak of the light color, 

 below which there is an irregidar narrow band of brown 

 separating it from the lighter color of the lower portion. 



Size and color are the featiu'es in which difterences are 

 to be detected between this specimen and the larger ones. 

 Those that obtain are such as will disappear with age. The 

 several large individuals from the same island nearly ap- 

 proach a number secured by the Hassler Expedition, for 

 the Museum Comparative Zoology, from Albemarle. The 

 most notable of the diflerences between them appear in the 

 higher labials, as compared with the length, and in a more 

 concave frontal region on the specimens from Barrington, 

 which probably represent a distinct variety of the species. 

 The largest is about forty-tAVo inches in length, half of 

 which is tail. 



Concerning the dorsal crest there are several items it 

 may be well to notice here. In all cases the crest nearly 



