can
Museum of Natural History; only one of the latter has definite locality
data.

_Acknowledgments._--We are grateful to Dr. Ernest E.
Williams, Museum of Comparative Zoology (MCZ) and Dr.
Richard G. Zweifel, American Museum of Natural History
(AMNH) for the loan of specimens. We are further indebted to
Dr. Zweifel for permission to clear and stain one specimen.
Dr. William E. Duellman and Linda Trueb offered many
constructive criticisms. Miss Trueb executed the drawings of
the skull and finger bones. Mr. Martin Wiley provided x-ray
photographs of _Allophryne_.

METHODS AND MATERIALS

Six of the seven known specimens were available for study.
Measurements were taken in the manner described by Duellman
(1956). One specimen was cleared and stained, using the
technique of Davis and Gore (1936), in order to study the
skeleton. X-ray photographs were made of another specimen
for comparison.

_Specimens examined._--Six, as follows: BRITISH GUIANA,
_Dist. Demarara_: Marudi Creek, AMNH 44749; _Dist. Equibo_:
Tumatumari, MCZ 11790 (paratype); _Dist. Rupununi_
(_Berbice_): Wai Wai Country, N of Acarahy Mountains, west
of New River (2 deg.N, 58 deg.W), KU 69890. Also, 3 specimens from
"probably British Guiana," AMNH 70108-10 (70110 cleared and
stained).

SYSTEMATIC ACCOUNT

The availability of additional material and the new information
pertaining to osteology permit an amplification of Gaige's (1926)
description.

Genus ~Allophryne~ Gaige

_Allophryne_ Gaige, Occas. Papers Mus. Zool., Univ.
Michigan, 176:1, Oct. 14, 1926. Crawford, Annals Carnegie
Mus., 21(1):29, 32, Nov. 14, 1931. Noble, The biology of the
amphibia. McGraw-Hill, p. 510, 1931. Ruthven, Herpetologica,
1:3, July 11, 1936. Gallardo, Papeis Avulsos, 17:79, Jan. 1,
1965.

_Type species._--_Allophryne ruthveni_ Gaige.

_Diagnosis and definition._--A genus of diminutive frogs;
vomers, maxillae, and premaxillae edentate; skin of head
strongly anchored to connective tissue on cranium;
prepollical spine absent in males; disk of third finger
larger than tympanum, smaller than eye; no humeral hook in
either sex; ilia extending anteriorly beyond sacral
expansions; adults attaining snout-vent length of 31 mm.;
male having darkened external subgular vocal sac; skin of