repollical spine of right hand of
_Plectrohyla hartwegi_ (UMMZ 94428). x 5.]

Anal opening directed posteroventrally at level of mid-thigh; anal
sheath long with membranous connection to posterior surfaces of thighs.
Skin on dorsal surfaces finely tuberculate; that on throat, chest,
belly, and ventral surfaces of thighs granular, that on ventral surfaces
of arms and shanks smooth. Tongue nearly round, free posteriorly for
about one-fourth its length, barely notched behind. Upper jaw shallowly
notched medially. Maxillary-premaxillary teeth 38-35; prevomerine teeth
5-5, situated on small elliptical elevations between quadrangular
choanae; vocal slits absent.

Color (in preservative): uniform dull brown above and creamy yellow
below; flanks brown with creamy yellow mottling and dark brown spots in
groin; anterior surfaces of thighs creamy yellow with two broad,
vertical, dark brown bars proximally and two narrower, dull brown bars
distally; posterior surfaces of thighs brown with dark brown vertical
bars, interspaces cream-colored or brown. Ventral surfaces of shanks
creamy yellow with bold brown reticulations.

_Variation._--The paratypes are smaller, having snout-vent lengths of
48.3 and 41.8 mm. In these specimens the ratio of the length of the
tibia to the snout-vent length is 55.9 and 57.9 per cent, and the ratio
of the diameter of the tympanum to the diameter of the eye is 47.3 and
43.6 per cent, respectively. Both specimens have 4-4 prevomerine teeth;
one specimen has 37-36, and the other has 40-37, maxillary-premaxillary
teeth. In these small specimens the supratympanic fold is thin, and the
arms are not so robust as in the holotype. In one specimen (KU 58873)
the tongue is not notched posteriorly. The terminal subarticular
tubercle on each fourth finger is broad and flattened in UIMNH 40837,
but conical in KU 58873. Both specimens have bold creamy-yellow and dark
brown mottling on the flanks and dark brown reticulations on the ventral
surfaces of the shanks. There are two dark brown vertical bars on the
anterior and posterior surfaces of each thigh in KU 58873 and three bars
on each surface in UIMNH 40837.

_Comparisons._--_Plectrohyla hartwegi_ differs from all known species in
the genus by having boldly mottled flanks, dark reticulations on the
ventral surfaces of the shanks, and dark vertical bars on the shanks. In
all of the other species the anterior and posterior surfaces of the
thighs are unmarked, and