ansas Sci. Bull.,
33:339, March 20, 1950. Rabb and Mosimann, Occas. Papers Mus.
Zool. Univ. Michigan, 563:7, March 29, 1955.

_Plectrohyla crassa_, Hartweg, Occas. Papers Mus. Zool. Univ.
Michigan, 437:1, June 30, 1941. Stuart, Occas. Papers Mus.
Zool. Univ. Michigan, 455:6, January 5, 1942.

_Diagnosis._--Maximum snout-vent length in males 54 mm.; snout in
dorsal profile round; tarsal fold strong; inner metatarsal tubercle
small and elliptical; outer metatarsal tubercle small, flat, and
indistinct; foot fully webbed; nuptial spines on thumb small; thoracic
fold absent; anal opening at level of middle of femur; dorsum dull
olive-green; belly creamy yellow; chin gray with yellow flecks; flanks
dull olive-green with scattered cream-colored spots; and stripe faint,
cream-color; vocal slits absent.

_Description._--The following description is based on UIMNH 25050 from
Cerro San Felipe, Oaxaca. Adult male having a snout-vent length of
53.7 mm.; tibia length, 26.9 mm., 50.1 per cent of snout-vent length;
foot length (measured from proximal edge of inner metatarsal tubercle
to tip of longest toe), 25.4 mm.; greatest width of head, 17.6 mm.,
32.8 per cent of snout-vent length; head length, 16.0 mm., 29.8 per
cent of snout-vent length; diameter of eye, 5.4 mm.; diameter of
tympanum, 1.5 mm., 27.8 per cent of diameter of eye. Snout short, in
lateral profile bluntly rounded, in dorsal profile broadly round;
canthus absent; loreal region nearly flat; lips thick and not flaring;
nostrils barely protuberant; internarial distance, 3.8 mm.;
interorbital distance, 4.7 mm., somewhat broader than width of eyelid,
3.8 mm. Heavy dermal fold from posterior corner of eye above tympanum
and then to insertion of forearm; tympanum concealed above, its
diameter about equal to its distance from eye. Forearm thick; distinct
fold on wrist; prepollex enlarged bearing patch of small nuptial
spines continuous on side of digit; similar patch on second finger;
subarticular tubercles small and round, none bifid; few supernumerary
tubercles on proximal segments of digits; large, flat palmar tubercle;
fingers long and slender; length of fingers from shortest to longest,
1-2-4-3; discs moderately large; rudimentary web between second and
third fingers and between third and fourth. Legs thick; heels overlap
by about one-fourth length of shank when hindlimbs adpressed;
tibiotarsal articulation extends to posterior corner of eye; tarsal