HYLID^E. 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. HYLIDJ3. 



(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. 

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



/, HYLA, Laurenti. TREE FROGS. 



1. H. vers/ co/or, 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. 



