Descriptions of Two Species of Frogs, Genus Ptychohyla: Studies of American Hylid Frogs, VDuellman, William Edward
Science
Descriptions of Two Species of Frogs, Genus Ptychohyla: Studies of American Hylid Frogs, V
Duellman, William Edward
Frogs
Color (in alcohol) dark purplish brown on dorsal surfaces of
head, body, and shanks; thighs brown above and yellowish tan
posteriorly; white stripe extending from below eye above
forearm to mid-flank. Ventral surfaces creamy white;
ventrolateral glands orange-tan flecked with dark brown;
edge of lower lip with dark brown spots; narrow white line
on upper lip; palms white and soles brown.
Color (in life) uniform dark bright green above with creamy
white bar below eye; lateral stripe silvery white; ventral
surfaces deep yellow; posterior surfaces of thighs yellow
brown; iris reddish bronze.
_Variation._--Sixteen adult males are available; these have
snout-vent lengths of 26.3 to 28.5 mm. (average, 27.6 mm.).
The tympanum/eye ratio is 48.2 to 58.6 per cent (average,
53.2 per cent). The number of vomerine teeth varies from
four to six. The extent of the ventrolateral glands is
variable. In five specimens the glands nearly meet
midventrally; in two others the glands include the axillary
region; in none do the glands extend into the groin. In
other structural details there is no noticeable variation.
The greatest variation in color pattern is found in the
lateral stripe. The pale spot or bar below the eye is
present in all specimens; in one individual there is no
lateral stripe; in three the stripe extends posteriorly only
to above the forearm, in two to the mid-flank, and in the
others to the groin.
Although all of the males were bright uniform green above
when collected at night as they were calling, some changed
color later. In these individuals the dorsum became a
somewhat paler green with faint irregular yellowish tan
blotches.
The one available female (UMMZ 121399) has a snout-vent
length of 30.3 mm. and a tympanum/eye ratio of 52.8 per
cent, and is colored like the males. The tubercles by the
anal opening are placed irregularly and do not consist of
two pairs below the opening. There are no ventrolateral
glands, glandular area on the chin, or enlarged prepollex.
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