326 M. G. A. Boulenger on a 
XXXIII.— Description of a new Genus and Species of Frogs 
of the Family Hylide. By G. A. BOULENGER. 
THE new frog described in this paper was purchased of Mr. 
A. Forrer, who obtained it at Presidio, W. Mexico, and suc- 
ceeded in bringing it alive to England. Notes are appended 
on the coloration and habits of two other living frogs, obtained 
at the same place by the same collector. 
PTERNOHYLA, g. n. 
Distinguished from Hyla by the great development of the 
inner metatarsal tubercle, which is strongly compressed. 
Pternohyla fodiens, sp. n. 
Tongue circular, entire and slightly free behind. Vomerine 
teeth in two round groups close together between the choane. 
Head moderate, broader than long, entirely bony, rough; 
labial borders projecting and slightly raised; snout rounded, 
once and a half as long as the diameter of the orbit, the profile 
obliquely descending from the eyes; the distance from the 
nostril to the orbit equals the diameter of. the latter; canthus 
rostralis raised, curved; loreal region very wide, concave ; 
interorbital space much broader than the upper eyelid, deeply. 
concave; tympanum very distinct, half the diameter of the 
orbit. Fingers slender, slightly webbed at the base ; no pro- 
jecting rudiment of pollex ; toes slender, moderately elongate, 
one-third webbed ; disks of fingers and toes very small, much 
smaller than the tympanum; subarticular tubercles small, 
prominent; inner metatarsal tubercle large, compressed; no 
fold along the tarsus. The hind limb being carried forwards 
along the body, the tibio-tarsal articulation reaches the poste- 
rior corner of the eye. Skin of back closely granulate ; belly 
and lower surface of thighs granulate. Light brown above, 
with large elongate insuliform dark brown black-edged spots 
on the back, avoiding the vertebral line; flanks marbled 
with dark brown; thighs and groin sulphur-yellow, marbled 
