52 BARBOUR — SOUTH AMERICAN VERTEBRATES lasoeee 
of the choanae. Head as broad as long; snout flat, rather prominent, 
once and one-third the diameter of the eye; canthus rostralis indistinct; 
sides of snout slightly concave; eye large, prominent; tympanum distinct, 
about half the diameter of the eye. Fingers absolutely unwebbed, toes 
fully webbed; dises of fingers very well developed, broader than long; 
dises of toes round and smaller than those of fingers; subarticular tu- 
bereles inconspicuous; no tarsal fold. A very slight rudiment of a pollux. 
The hind limb being carried along the body, the tibio-tarsal articulation 
reaches between the eye and nostril. Upper surfaces smooth, lower sur- 
faces finely granulate. In life, green above, with a gray, almost colorless, 
spot between the shoulders; yellowish below; hinder side of thighs with a 
brilliant marbling of black and yellow, this marking extends to the pos- 
terior portion of the sides. In alcohol the green has changed to a dusky 
brown, the yellow to dirty white. 
Named for Mr. Clarence L. Hay, an enthusiastic helper on many 
collecting excursions. 
EXPLANATION OF THE PLATES. 
Puate IV. 
Diploglossus resplendens. Dorsal and ventral views. 
Puate V. 
Upper figure. Dorso-lateral view of type of Liolaemus alticolor. 
Lower figure. Dorso-lateral view of type of Hyla hayzi. 
