176 3. IGUANIDJE 



irregular, largest on frontal and prefrontal regions, every- 

 where smooth and rather flat. Several subocular plates, 

 middle one very long and strongly keeled. Superciliaries 

 rather small, but strongly imbricate. Eyelids with well 

 developed fringe. Supralabials strongly imbricate and pro- 

 duced laterally so as to give snout a rounded outline when 

 seen from above. Infralabials small and juxtaposed. Sev- 

 eral series of flat sublabials. Gulars granular and smooth, 

 growing larger and imbricate on fold. Back and sides cov- 

 ered with scales or granules, largest near middle of back 

 and changing gradually to larger smooth ventrals. A dermal 

 fold usually present along each side between limbs. Tail 

 of moderate length, flattened near the body, its scales keeled 

 and slightly imbricate. Limbs rather long, not very slender. 

 Eleven to 14 femoral pores. 



The color above is gray, yellow, or brown, often with 

 a reddish tint, with four series of dark undulate or triangular 

 blotches, and numerous small light spots. The blotches are 

 often more or less obsolete, and are most distinct in females 

 and young. The top of the head is colored like the back, 

 but without definite markings. The limbs are crossed by 

 dark bars. The throat is white marbled with dusky. The 

 belly is white or yellow, with two or three black bars on the 

 sides usually surrounded with blue. The tail is grayish or 

 brownish above, white below without dark cross-bars. 



Length to anus 50 52 55 64 



Length of tail 58 67 76 78 



Snout to back of interparietal 9 9^2 10 10 



Width of head 9 10 10 \\ l / 2 



Fore limb 23 25 27 29 



Hind limb 40 44 49 50 



Base of fifth to end of fourth toe 16 18 20 19 



Distribution. Holbrookia elegans originally was de- 

 scribed from Mazatlan, Sinaloa, Mexico. Specimens col- 



