by all workers (see discussions
by Firschein, 1954:50; Langebartel and Shannon, 1956:164; and Dixon,
1957:383). I have referred _saxatilis_ to the genus _Tomodactylus_ on
the basis of a lumbar gland, which was considered a distinguishing
character for the genus by Smith and Taylor (1948:46) and Langebartel
and Shannon (1956:165). Lumbar glands are longer than broad, at least
one third the distance from axilla to groin, lateral and usually high,
and often conspicuous and protuberant. The elevation or flatness of
the lumbar glands seems to be due to individual variation; living
specimens in the field had conspicuous and protuberant, or
non-elevated, indistinct lumbar glands. Lumbar glands are not to be
confused with inguinal glands, which are roundish, often yellowish,
sometimes diffuse, lateral but low, often inconspicuous, and usually
not protuberant. Inguinal glands occur in the genus _Microbatrachylus_
and in some species of _Eleutherodactylus_, and have been described as
flat, or low, or small, or indistinct for most species of
_Syrrhophus_.

For financial assistance with field work I am grateful to Rollin H.
Baker, and those individuals who administer the Michigan State
University Development Fund and the Bache Fund of the National Academy
of Sciences (Grant No. 463). I am grateful also to J. Keever Greer,
Donald F. Switzenberg, and Rudolph A. Scheibner for aid in the field,
to Edward H. Taylor, James R. Dixon, and William E. Duellman for
profitable discussions, and to Thomas Sweringen for figure 1. The
specific name alludes to the habitat (Latin, _saxatilis_ = found among
rocks).

LITERATURE CITED

DIXON, J. R.
1957. Geographic variation and distribution of the genus
Tomodactylus in Mexico. Texas Journ. Sci., 9(4):379-409,
5 figs., 1 map, December.

DUELLMAN, W. E., and DIXON, J. R.
1959. A new frog of the genus _Tomodactylus_ from Michoacan,
Mexico. Texas Journ. Sci., 11(1):78-82, 1 fig., 1 table,
March.

FIRSCHEIN, I. L.
1954. Definition of some little-understood members of the
leptodactylid genus _Syrrhophus_, with a description of
a new species. Copeia, 1954, 1:48-58, February 19.

LANGEBARTEL, D. A., and SHANNON, F. A.
1956. A new frog (_Syrrhophus_) from the Sinaloan lowlands of
Mexico. Herpetologica, 12(3):163-165, 2 figs., September 1.

SMITH, H. M., and TAYL