ts of
immature specimens, the males in that series do possess vocal sacs.
Since these were not breeding individuals, the sacs are not well
developed. The characters of the anal tubercles and the relative width
of the head are of no value in separating the two species. The
apparently aestivating individuals comprising the type series of _Hyla
smaragdina_, and the type of _Hylella azteca_, which also was found in a
bromeliad, were green in life. Of the calling males found on the coast
of Michoacan, most were yellowish tan when found; two were pale green,
but soon changed to pale tan. Calling males from Copuyo and Dos Aguas
were pale yellowish tan. Therefore the color of the dorsum is of little
significance in distinguishing the two named populations.

Males of _Hyla smaragdina_ have been found calling in the months of June
and July from rocky streams; the call is a nasal "haah-haah-haah,"
repeated quickly and constantly for as long as 30 seconds. As pointed
out by Duellman (1958c:9), this breeding behavior is unlike that
suggested by Taylor (1943b:51). In Michoacan _Hyla smaragdina_ has been
found in tropical semi-deciduous forest, oak forest, and
mesquite-grassland at elevations from 150 to 1500 meters.

~Hyla smithi~ Boulenger

_Hyla smithi_ Boulenger, Zool. Rec. Reptilia and Batrachia,
38:33, 1902.--Cuernavaca, Morelos, Mexico.

Aguililla (14); Apatzingan (104); Arteaga; Charapendo (5);
Coalcoman (11); El Sabino (44); La Playa (6); Lombardia (2);
Nueva Italia (8); Playa Azul; Salitre de Estopilas (2).

This small hylid is abundant in the Tepalcatepec Valley to elevations of
about 1000 meters; it was found infrequently on the coastal lowlands.
Males call from bushes in and around flooded fields and ditches, from
grasses and small herbs in the water and from vegetation overhanging
small streams. The call consists of a series of short, high notes,
somewhat reminiscent of a katydid's song. In the dry season occasional
males were heard calling from irrigated fields near Apatzingan. In the
daytime individuals were found in the axils of leaves of the
elephant-ear plants (_Xanthosoma_).

In living individuals the dorsal color usually is uniform pale yellow;
often the lateral white stripe is barely visible. The vocal sac is
bright yellow, and the iris is pale gold. In some individuals there are
scattered dark brown spots or flecks on the back and upper surfaces of
limbs. Twenty males from Apatz