ld short and weak; inner metatarsal
tubercle moderate in size and elliptical; outer metatarsal tubercle
small, round, and indistinct; webbing extending to base of penultimate
phalanx of fourth toe; nuptial spines on thumb small; weak thoracic
fold present; anal opening above level of middle of thighs; dorsum
dark brown with dark reticulations; venter brown with cream-colored
flecks; flanks brown with creamy white spots; anal stripe absent;
small white spots in anal region; vocal slits absent.

_Description._--The following description is based on KU 57651 from El
Chico Parque Nacional, Hidalgo. Adult male having a snout-vent length
of 45.1 mm.; tibia length, 22.1 mm., 49.0 per cent of snout-vent
length; foot length (measured from proximal edge of inner metatarsal
tubercle to tip of longest toe), 21.5 mm.; greatest width of head,
13.7 mm., 30.4 per cent of snout-vent length; head length, 12.6 mm.,
27.9 per cent of snout-vent length; diameter of eye, 4.0 mm.; diameter
of tympanum, 1.8 mm., 45 per cent of diameter of eye. Snout short, in
lateral profile blunt, in dorsal profile round; canthus rounded;
loreal region slightly concave; lips thick, round, and not flaring;
nostrils slightly protuberant; internarial distance, 3.6 mm.;
interorbital distance, 4.0 mm., slightly broader than width of eyelid,
3.5 mm. A moderately heavy dermal fold from posterior corner of eye
above tympanum and curving downward towards insertion of forearm;
tympanum nearly round, covered by dermal fold above, its diameter
slightly less than its distance from eye. Forearm moderately robust;
distinct fold on wrist; prepollex much enlarged with patch of small
nuptial spines continuous on side of digit; similar line of nuptial
spines on inner edge of second finger; subarticular tubercles round,
moderate in size, none bifid; supernumerary tubercles small and
present only proximally; fingers long and slender; length of fingers
from shortest to longest, 1-2-4-3; discs moderately large, that on
third finger about size of tympanum; no web between first and second
fingers; rudimentary web between other fingers. Legs robust; heels
over-lap by about one-fourth length of shank when hind limbs
adpressed; tibiotarsal articulation extending to posterior corner of
eye; tarsal fold weak, extending to about middle of tarsus; inner
metatarsal tubercle moderately large, flat, and elliptical; outer
metatarsal tubercle small, round, and indistinct; subarticular
tubercles