HYLID^. — 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. — HYLID^. 



{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. . Acms, 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. Pickerixg'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. triseriaius, (Wied.) Baird. Tree Frog. E. U. S. 



