366 3. IGUANIDJE 



it showed signs of renewed energy and was ready to run at 

 anyone's approach." 



SYNOPSIS OF SPECIES AND SUBSPECIES 

 a, Nostrils opening on or almost on the lines joining the 



supraorbital ridges with the end of the snout, 

 b. Gular scales small, nearly equal-sized or with one 

 row on each side enlarged 5 a series of enlarged 

 scales below, but not very much larger than, the 

 lower labials; occipital spines very short or absent; 

 peripheral fringe of one series of spinose scales. 

 c. Ventral scales smooth; no prominent ridge from 

 tip of postorbital boss to outer enlarged temporals 5 

 lower jaw not enormously developed posteriorly; 

 one to three rows of smooth scales between infrala- 

 bials and enlarged sublabials. 

 d. Head-spines smaller; occipitals usually nearly 



erect. 



e. Size smaller; head spines very rudimentary; 

 temporal spines erect like occipitals, not pointing 

 posteriorly. p d douglassii.-p. 368. 



e*. Size larger; head spines a little larger; temporal 

 spines less erect, not parallel to occipitals. 



P. d. ornatissimum. p. 377. 



d*. Head-spines larger; occipitals usually directed 

 backward, nearly parallel with temporals; tem- 

 poral spines often reddish. 



P. d. hernandesi. p. 382. 



c". Ventral scales strongly keeled; a prominent ridge 

 from tip of postorbital boss to outer enlarged tem- 

 porals; lower jaw enormously enlarged posteriorly; 

 five to seven rows of keeled scales between infra- 

 . - : labials and enlarged sublabials. 



P. cTitmarsi. p. 386. 



