184 BATRACHIA: SALIENTIA. — XXVII. 
266. HYLA Laurenti. (vAn, forest.) 
518. H. versicolor Le Conte. Common TREE Toap. Green, 
gray or brown, with irregular dark blotches; below yellow, behind 
white; tympanum 2 diam. eye; fingers } webbed; skin with small 
warts. L.2. E. U.S., W. to Kan., very abundant and variable. 
Its “clear, loud trilled rattle” is heard mostly in the evening and 
in damp weather. 
519. H. pickeringii Holbrook. Yellowish brown or fawn-color, 
with dusky rhomboidal spots and lines, the latter usually arranged 
in the form of an oblique cross; head with lines; limbs barred ; 
tympanum very obscure. L.1. E. U.S. 
520. H. squirella Daudin. Olive green, with irregular dark 
blotches ; a dark bar between eyes; a white line along upper jaw 
to shoulder ; greenish white below, darker behind ; throat with a 
few dark spots; legs marked with darker above ; tympanum half 
diam. eye. L.14. Ind. (Brookville, A. W. Butler) to S. C. (Eng. 
squirrel. ) 
521. H. andersonii Baird. Deep pea-green; sides with irre- 
cular yellow spots; a green spot on throat; a purplish band from 
eye to arm; tympanumteye. L.1}. N. J. toS.C., rare. 
Famity CVII]. ENGYSTOMATIDA. (Tue Tooruiess 
FRoGs.) 
Froglike Batrachians with the maxillaries toothless and the 
diapophyses of the sacral vertebrae dilated. Genera 18; species 
54, chiefly tropical. 
a. Pupil erect; tongue elliptical ; tympanum hidden; toes free; no preco- 
racoids. rey me ere er ee ee pra ee e y e o 
267. ENGYSTOMA Fitzinger. (éyyvs, contracted; oroya, 
inoue. Y, |. Ayr 
522. BE. carolinense Holbrook. Snout obtuse, not twice eye; 
skin smooth, a fold across head behind eyes. Brown, dotted with 
paler below. L.1. S. U.S., N. to Mo. 
Famity CIX. RANIDAK. (THE FroGs.) 
Teeth well developed on upper jaw, and usually on vomer also; 
toes 4-5, all more or less webbed; ear well developed. Genera 18, 
species 250, chiefly of the Northern Hemisphere and the East 
Indies. Most of them are aquatic, and similar to our common 
frogs. 
a. Vomerine teeth present; no finger opposable to the others; tongue emargi- 
nate behind; hind toes full-webbed. - Rana, 268. 
268. RANA Linneus. (Lat., frog.) 
a. Glandular folds on each side of back more or less distinct; web of feet not 
reaching tip of fourth toe. 
