HYLIDJE. LXXIX. 189 



/. SCAPHIOPUS, Holbrook. SPADE FOOTS. 



1. S. holbrookii, (Harlan) Baird. SOLITARY SPADE 



FOOT. Heel with a sharp -edged spur; olive brown, a 



pale yellow streak on each side. E. U. S., not very 



common; burrows in the ground. (S. solitarius, Holbr.) 



FAMILY LXXIX. HYLIDJE. 



(The Tree Frogs) 



Arboreal frogs of small size, having the fingers and 

 toes more or less dilated into disks at their tips; ear well 

 developed. Genera ten; species sixty; found in most 

 parts of the world; noted for their shrill voices. 



* Disks round, conspicuous ; fingers somewhat webbed ; skin 



roughened HYLA, 1. 



** Disks small ; fingers not webbed, 

 f Toes webbed only at base or not at all ; tympanum distinct. 



CHOROPHILUS, 2. 

 ff Toes broadly webbed ; tympanum indistinct. . ACRIS, 3. 



/. HYLA, Laurenti. TREE FROGS. 



1. H. versicolor, LeConte. COMMON TREE TOAD. 

 Green, gray or brown, with irregular dark spots; below 

 yellow or white; fingers one -third webbed; exceedingly 

 variable. E. U. S., very abundant. 



2. H. pickeringii, Holbrook. PICKERING'S TREE TOAD. 

 Yellowish brown with dusky rhomboidal spots and lines 

 sometimes arranged in the form of a cross. E. U. S. 



3. H. andersonii, Baird. ANDERSON'S TREE TOAD. 

 Deep pea-green; sides with irregular yellow spots; a 

 purplish band on sides of head. N. J. to S. C., rare 



2. CHOROPHILUS, Baird. LITTLE TREE FROGS. 

 1. C. triseriatus, (Wied.) Baird. TREE FROG. E. U. S. 



