290 BATRACHTA SALIENTIA. 
Width of head 6 ee we RB tim. 
Distance of vent from snout . . . .... ... 7 4, 
> 7 heel. ea eee ee ee ale Dy 
» Pa metatarsal joint. . . . . . . 92 ,, 
» 7 end of fourth toe . . . . . .120~=~=,, 
The descriptive diagnosis, as given above, may comprise several races; at any rate, 
specimens from Guatemala may be readily recognized by their broader digital web, 
which reaches the disks of the two outer fingers, and by their larger tympanum. ‘Two 
of the Costa Rica specimens show, besides, some of those round yellow spots by which 
a resemblance to a dead leaf is attained, and which are present also in some other Tree- 
Frogs of Tropical America. 
2. Agalychnis callidryas. 
Hyla callidryas, Cope, Proc. Ac. N. Sc. Philad. 1862, p. 359. 
Agalychnis callidryas, Cope, Bull. U. S. Nat. Mus. no. 82, p. 15 (1887). 
Hab. Mexico, near Cordova (Sumichrast) ; Panama (Field). 
Head elongate ; sides of snout subvertical, with rounded canthus. Tympanum nearly 
as large as the eye, obliquely elliptical. Vomerine teeth in two oblique series. Fingers 
one-fourth webbed, with very large disks; toes half-webbed. When carried forward, 
the heel reaches the end of the snout. Bluish-purple above, lower parts and concealed 
parts of the limbs uniform saffron-yellow; numerous oblique bands of a lighter yellow 
on the sides. (After Cope.) 
Length of body . . . . . 2... 48 millim. 
8. Agalychnis helene. 
Agulychnis helene, Cope, Proc. Am. Phil. Soc. 1884, p. 182; 1886, p. 274; Peracca, Boll. Mus. 
Zool. Torino, xi. no. 253, p. 12 (1896). 
Hab. Mexico, Teapa, Tabasco (H. H. Smith); Nicaracua, Hacienda Rosa de J ericho, 
alt. 8250 feet (Rothschuh) ; Costa Rica, San Carlos (Underwood); Panama, Darien, 
Rio Sabana (Festa). 
Head broad; snout as long as the eye, with subvertical sides and distinct canthus. 
Tympanum two-thirds the length of the eye, coloured and rather indistinct. The two 
outer fingers are nearly two-thirds webbed, the web not quite reaching the disk; the 
web between the second and third fingers much narrower, only about one-fourth, and 
that between first and second still more reduced ; disks about size of tympanum. ‘Toes 
two-thirds webbed. When carried forward, the heel reaches the end of the snout. 
Green above ; sides yellow, with large black spots which are separated by vertical lines 
or narrow bands of the yellow ground-colour; concealed parts of the limbs dark 
