Descriptions of New Hylid Frogs From Mexico and Central AmericaDuellman, William Edward
Science
Descriptions of New Hylid Frogs From Mexico and Central America
Duellman, William Edward
Frogs -- Central America; Frogs -- Mexico; Hylidae
Color (in preservative): pale tan above with dark brown mark in
occipital region and large irregular brown mark extending from scapular
region to sacral region; anterior and posterior surfaces of thighs and
flanks lacking pigment; dorsal surfaces of arms, shanks, and feet tan
with brown transverse bars (two on each forearm, two on left shank, one
on right shank, and one on each foot); entire dorsal surfaces, except
hands and first four toes, peppered with black; venter creamy white;
roof of mouth between, and anterior to, choanae speckled with minute
black flecks.
Color (in life): yellowish tan above with reddish brown flecks (later
changed to pale brown with dull olive-green interorbital bar, blotch on
back, and flecks on dorsum); hands, feet, and anterior and posterior
surfaces of thighs dull yellow; belly white; creamy white stripes on
outer edge of forearm, foot, and above anus; iris pale silver-bronze.
_Variation._--Three adult males (including holotype) have snout-vent
lengths of 25.2-27.3 (mean 26.5) mm., and two females have 28.6 and 31.6
(mean 30.1) mm. One juvenile has a snout-vent length of 21.5 mm. No
significant variation occurs in the proportions. Males have 6-8, and
females have 8 and 9, prevomerine teeth. The tympanum is completely
concealed in all specimens.
All specimens have distinct transverse bars on the limbs; the number of
bars on the shank varies from one to four. Two individuals are dark
brown dorsally; in these the small black flecks either are not visible
or are absent; flecks are present on the dorsal surfaces of four
specimens that are tan or pale brown above with darker brown irregular
markings.
The coloration in life consisted of olive-green or olive-brown markings
on the body and olive-green or brown bars on the limbs. The dorsal
ground color was yellowish tan or pale brown in all individuals.
_Comparisons._--_Hyla pellita_ differs from all known Middle American
_Hyla_, except _mixe_, _mixomaculata_, _nubicola_, and _pinorum_, by
having a concealed tympanum. The first three of these differ from
_pellita_ in greater size and by having many bands on the hind limbs.
Superficially _H. pellita_ resembles _Hyla pinorum_, which likewise
has a tan dorsum with irregular markings and limbs with transverse bars.
_Hyla pinorum_ differs from _pellita_ by having a proportionately larger
head, no transverse bands on the thighs, and large tubercles below the
anus. Furthermore, in _pinorum_ the quadratojugal articulates with the
maxillary, whereas in _pellita_ the quadratojugal is reduced to a small
spur and does not articulate with the maxillary.
_Remarks._--All individuals were found on low vegetation along streams
in cloud forest at night. No specimens were found when the type locality
was revisited in August, 1966.
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