beneath logs and rocks in a damp canyon in coniferous forest.
Among the juveniles in this series is a completely transformed
individual (UMMZ 102093) having a snout-vent length of 14.5 mm. Five
adults have snout-vent lengths of 36.2-39.5 (38.0) mm. _Hyla lafrentzi_
has noticeably longer hind limbs than _H. eximia_; in the former, when
the hind limb is brought forward along the body, the tibiotarsal
articulation extends to the snout. There are dark transverse bands on
the hind limbs; the dorsolateral stripe is broken into an anterior and a
posterior segment, and the latter is narrowly bordered by white in most
specimens.

_Hyla lafrentzi_ occurs at higher elevations than any other frog in
Michoacan; the locality records from throughout the range indicate that
it is restricted to pine and pine-fir forests. In these habitats it
replaces _Hyla eximia_, which inhabits the lower pine-oak forests and
mesquite-grassland on the Mexican Plateau. Ponds are absent at places
where _Hyla lafrentzi_ has been collected; possibly the eggs are laid in
streams.

~Hyla smaragdina~ Taylor

_Hyla smaragdina_ Taylor, Copeia, No. 1:18, March 30,
1940.--6 kilometers east of Cojumatlan, Michoacan, Mexico.

_Hylella azteca_ Taylor, Proc. Biol. Soc. Washington, 56:49,
June 16, 1943.--Tepoztlan, Morelos, Mexico.

Cojumatlan (30); Copuyo (7); 18 km. E of Dos Aguas (22);
Ostula (8); Pomaro (3); Sahuayo; Salitre de Estopilas (7).

Taylor (1940a:18) diagnosed this species as having few or no vomerine
teeth, no vocal sac, a rather broad and flat head, two large tubercles
below the anus, a granular venter, and a green dorsum in life. The
specimens on which the description was based are either immature or
non-breeding individuals; all were collected from bromeliads growing on
cacti near Cojumatlan. Another small, flat-headed hylid from Tepoztlan,
Morelos, was described and diagnosed by Taylor (1943b:49) as differing
from _Hyla smaragdina_ in having a vocal sac and a broader head. This
specimen was named _Hylella azteca_. Specimens from the coastal region
of Michoacan and Colima were referred to _Hylella azteca_ by Peters
(1954:7) and Duellman (1958c:8).

Comparison of topotypic _Hyla smaragdina_ and the holotype of _Hylella
azteca_ (UIMNH 25044) with the several series of specimens from
Michoacan has resulted in the conclusion that all pertain to only one
species. Although the type series of _Hyla smaragdina_ consis