The skin is roughened in H. arenicolor, smooth in H. regilla. This 

 frog has slight webs between the fingers. 



Structure: Long arms and legs with large disks on tips of fingers 

 and toes; slight webs between the fingers; skin somewhat roughened; 

 more or less uniform in color; tympanum small; prominent fold across 

 breast; prominent fold on tarsus. 



Voice: This call has been described as the "quack of a duck" by 

 Storer; and as the "bleat of a goat" by Duges. To us, the note 

 sounded lower, much weaker and less blatant than that of Hyla 

 versicolor and not so persistent. 



Breeding: They breed from March I to July I. The eggs are single, 

 floating near the surface or on the bottom of the pool usually at- 

 tached to leaves. (Atsatt and Storer). The tadpole is medium, 2 inches 

 (50 mm.), dark olive in color with some tail crests suffused with red- 

 dish orange pink to coral red. The tooth ridges are 2/3. After a tad- 

 pole period of 40 to 75 days, they transform from June 1 to August 

 15, at 3/ '5 inch (14-16 mm.). 



Notes: July 16, 191 7. Pinaleno Mts., Ariz. On the rocks over the 

 water, Anna put her hand accidentally on a Hyla arenicolor and Ray 

 Shannon found another on a tree trunk about four feet up. Paul 

 Needham found 'another on a boulder just over the water. They do 

 not seem at home in the swifter water. 



July 5, 1925. Fern Canyon (near Alpine, Tex.). In the ravine just 

 after a drenching rain, we found four transformed Hyla arenicolor On 

 the boulders some twenty-five or more feet above the level of the 

 creek. The creek was full of them before the rain. Today, July 6, the 

 creek is down and clear. Near the falls we often found one or two 

 Hyla arenicolor tadpoles amongst the bounders in shallow water or 

 swimming at the surface. We secured today only one mature tadpole. 

 The rest were small tadpoles. At the pool below the falls were many 

 of them. . . . Also some above the falls. 



July 7, Ranger Canyon. About 6:45-7 p. m., we arrived at the big 

 pool or falls of east Ranger Canyon. Mr. L. T. Murray espied a frog 

 in amongst the rocks in our very midst. It was an adult female 

 Hyla arenicolor. 



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