100 bulletin: museum of comparative zoology. 



the snout. Digits considerably dilated, 16 lamellae under phalanges II and 

 III of the fourth toe. Tail somewhat compressed, covered with rather large, 

 equal, strongly keeled scales. 



Color. — Bright pui'ple above, lower surfaces lighter and buffish. Gular ap- 

 pendage large, whitish, with lines and dots of lilac at the base. • The under 

 surfaces of the thighs are buff with indistinct wavy bauds of pale lilac. 



Head 16 mm. 



Width of head 9 " 



Body 51 " 



Fore limb 38 " 



Hind limb 60 " 



Tibia U " 



4- Basiliscus americanus Laur. * 



Sixteen examples of this widely spread species, which do not appear to differ 

 from typical specimens from Panama. 



5- Enyalioides insulae, sp. no v. 



Types. — Mus. Comp. ZooL, No. 6,983, Gorgona Island. 



Two specimens, closely allied to E. lieterolepis Bocourt. The ventral scales, 

 however, are only very slightly keeled. The spinose lateral scales, considerably 

 enlarged, form three longitudinal series on each side of the back. On the flanks 

 ai-e only a few scattered enlarged scales : these do not fall into vertical series, as 

 is the case with E. lieterolepis. The color of this island race is uniform rich 

 mahogany brown above ; ivory or creamy white below. There are forty-one 

 distinct spiny whorls evident upon the tail, which is brown above and below at 

 the tip. 



Head 2.5 mm. . 



Widtli of head 20 " 



Body 73 " 



Fore limb 47 " 



Hind limb 102 " 



Tibia 35 " 



Tail 165 " 



6- Iguana tuberculata Laue. 

 A single young male. 



TEIIDAE. 



7- Ameiva bridgesii (Cope). 



Four specimens agree perfectly with the descriptions of continental speci- 

 mens, except that in these island examples the keels on the dorsal scales are 

 obsolescent. 



