196 CALIFORNIA ACADEMY OF SCIENCES [Proc. 47H SER. 
in deep and shaded valleys about three miles northeast of Nago. 
Its croak is a single very loud deep-toned bark. The stomachs 
of three specimens each contained a fresh-water crab. Babina 
holsti lives in the same situations, and when these two kinds 
of frogs were caught they were put into the same collecting 
bag. The result of this was that several specimens (as Nos. 
22807, 22617, 22808) of Rana namiyer were badly wounded 
by the dagger-frogs. One was cut so deeply that much of the 
ovaries and small intestine protruded. 
In life, the color above is olive bronze mottled with black, 
and beneath it is white mottled with brown. The front of 
arms, groin, inner surface of calves and the dorsum of the 
foot are golden brown. The pupil is garnet, rhomboidal, with, 
long axis parallel to the mouth. The iris 1s golden-edged. 
From each angle of the pupil a dark band extends to the outer 
rim of the eye; the posterior is horizontal and broader, the 
anterior directed downward at forty-five degrees, the superior 
faintest. The upper half of the iris is tinged with bronze, the 
lower half is gray, and both show dark reticulations. 
On May 8th, 1910, some eggs (No. 22675) were found in 
a little puddle by a brook, and from a crevice leading from this 
puddle one of the females was taken. 
Babina Van Denburgh 
Diagnosis.— Like Rana, but with a large, sheathed, bony 
spur on inner side of hand in the position of the metacarpal 
of pollex. 
Type.—Rana holsti Boulenger. 
Two large frogs from the Loo Choo Islands have been 
described as Rana holsti Boulenger and Rana subaspera Bar- 
bour. In the descriptions of both attention was called to the 
large development of the first metacarpal or rudimentary 
pollex. The abundant material in the present collection, and 
the field notes which accompany the specimens, indicate that 
this structure is so remarkable as to justify the placing of 
these frogs in a separate genus. What at first sight appears 
to be an innocent rudiment of a thumb is in reality a most for- 
midable weapon. 
