336 HYLIDA. 
from the tip of the snout through the eye to the middle of the 
side ; beneath whitish, immaculate. From snout to vent 25 millim. 
Great Bear Lake. 
a.. Great Bear Lake. 
Well distinguished from C. triseriatus by its shorter hind limbs. 
3. ACRIS. 
Acris, Dum. § Bibr. viii. p. 506; Gitinth. Cat. p.71; Cope, Nat. Hist. 
Rev. 1865, p. 110, and Journ. Ac. Philad. (2) vi. 1866, p. 86. 
Pupil horizontal. Tongue heart-shaped, free behind. Vomerine 
teeth. Tympanum indistinct. Fingers free, toes extensively webbed, 
the tips dilated into very small disks. Outer metatarsals united. 
Omosternum cartilaginous; sterfium a cartilaginous plate. Diapo- 
physes of sacral vertebra very slightly dilated. 
North America. 
1. Acris gryllus. 
Acris gryllus, Giinth. Cat. p. 71. 
Rana gryllus, Leconte, Ann. Lyc. N. Y.1i. p. 282; Harlan, Med. Phys. 
Res. p. 104. 
dorsalis, Harlan, 1. c. p. 105. 
Acris gryllus, Dum. §& Bibr. p. 507 ; Leconte, Proc. Ac. Philad. 1855, 
. 28. 
ir lodes eryllus, Holbr. 1. c. pl. 33. 
Acris acheta, Baird, Proc. Ac. Philad, 1855, p. 59. 
Habit slender. Vomerine teeth in two oblique groups between 
the choane. Head elongate; snout acuminate, nearly twice as 
long as the diameter of the eye; interorbital space as broad as the 
upper eyelid. First finger a little shorter than second; toes two- 
thirds webbed ; subarticular tubercles rather small; two small 
metatarsal tubercles. The hind limb being carried forwards along 
the body, the tibio-tarsal articulation reaches the tip of the snout or a 
little beyond. Skin smooth or slightly tuberculous, belly granulate. 
Coloration very variable ; generally a large triangular dark-brown 
spot between the eyes; sometimes a light dorsal band. Male with 
a sugbular vocal sac. 
United States: the typical form confined to the Austro-riparian 
region, the var. crepituns to the Eastern and Central regions. 
a, Her. South Carolina. Dr. Harlan [P.]. (As typical 
of Rana dorsalis.) 
b-e. 2 & her. South Carolina. 
d. Many spec.: ¢, N. America. Edward Doubleday, Esq. [ P.]. 
DF ae ae: : 
Var. crepitans. 
Hylodes gryllus, Dekay, New York Faun., Rept. p. 70, pl. 22. 
Acris crepitans, Baird, Proc. Ac. Philad. 1855, p. 59; Leconte, cod. 
