336 HTLIDJS. 



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. 2- Great Bear Lake. 



"Well distinguished from 0. triseriatus by its shorter hind limbs. 



3. ACRIS. 



Acris, Dum. §■ Sih: viii. p. 606 ; Giinth. Cat. p. 71 ; Cope, Nat. Hist. 

 Rev. 1865, p. 110, and Journ. Ac. PMlad. (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 ; sternum 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. Lye. N. Y. i. p. 282 ; Harlan, Med. Phys. 



Res. p. 104. 



dorsalis, Harlan, I. c. p. 105. 



Acris gryllus, Ihim. ^ Bibr. p. 507 ; Leconte, Proc. Ac. PMlad. 1865, 



p. 28. ^ 

 Hylodes gryllus, HoTbr. I. c. pi. 33. 

 Acris acheta, JBaird, lYoc. Ac. Philad. 1865, p. 59. 



Habit slender. Vomerine teeth in two oblique groups between 

 the choanse. 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 ; subartioular 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. crepitans to the Eastern and Central regions. 



a. Hgr. South Carolina. Dr. Harlan [P.]. (As typical 



of Rana dorsalis.) 

 b-c. 2 & hgr. South Carolina, 



rf. Many spec. : d, N.America. Edward Doubleday, Esq. [P.]. 



5,&hgr. 



Vae. crepitans. 



Hylodes gryllus, Dekay, New York Faun., Eept. p. 70, pi. 22. 

 Acris crepitans, Baird, Proc, Ac, Philad. 1865, p. 59 ,• Leconte, eod. 



