fluent posteriorly in three; lateral white stripe
extending to groin in 16 specimens.

_Ciudad Hidalgo._--Thirty-six specimens (UMMZ 119163),
26.4-30.9 (28.2) mm. Dorsolateral dark stripe or row of
spots present only posteriorly in most; no brown spots in
the green fields of many specimens; large brown inguinal
spot in most specimens; heavy spotting dorsally in four;
lateral and dorsolateral dark stripes confluent posteriorly
in five; lateral white line extending to groin in most
specimens.

_Tuxpan._--Fifteen specimens (UMMZ 115227), 28.7-33.0 (30.5)
mm. Dorsolateral dark stripe or row of dashes in all
specimens; dark spots in lateral green fields, at least
posteriorly in most; dark spots posteriorly in the dorsal
green field in five; lateral dark stripe separated from
dorsolateral stripe in all specimens; lateral white line
extends to the groin in all specimens.

As can be seen from the above descriptions, the distinguishing
characters of _Hyla microeximia_--confluence of lateral and dorsolateral
dark stripes posteriorly, extent of lateral white stripe, and
distribution of dark spots dorsally--are found in individuals from all
of the populations sampled. In the samples from western Michoacan there
is a higher incidence of _microeximia_-like frogs than in those from
other parts of the state. _Hyla eximia_ is a wide-ranging species
varying greatly geographically and individually. A thorough review of
the species and related members of the _Hyla eximia_-group is necessary
before certain populations can justifiably be segregated as subspecies
or species.

In Michoacan _Hyla eximia_ has been collected in mesquite-grassland,
pine-oak forest, and cultivated areas on the Mexican Plateau from 1500
to 2300 meters; apparently it is absent from the Sierra de Coalcoman.
This is the most abundant frog on the southern part of the Mexican
Plateau; in the rainy season breeding choruses are found in temporary
pools and in the marshes adjacent to the permanent lakes.

~Hyla lafrentzi~ Mertens and Wolterstorff

_Hyla lafrentzi_ Mertens and Wolterstorff, Zool. Anz.,
84:235, August 25, 1929.--Desierto de los Leones, Distrito
Federal, Mexico.

Cerro San Andres (26); Opopeo (9).

In March, 1949, James A. Peters collected this species at elevations of
2400 to 2800 meters on the west slope of Cerro San Andres. The frogs
were found