A) Number of specimens
B) Maximum snout-vent length
C) Tibia length/Snout-vent length
D) Tympanum/Eye
E) Vomerine teeth
==================+========+======+=======+=========+=========+=======
Species | Sex | A | B | C | D | E
------------------+--------+------+-----------------+-----------------
| | | | | |
_P. euthysanota | [Male] | 17 | 38.1 |44.4-55.0|48.6-63.8| 4-6
euthysanota_ | | | | (48.7) | (56.3) | (5.1)
| | | | | |
|[Female]| 15 | 53.3 |46.5-56.6|42.9-56.4| 6-18
| | | | (51.4) | (51.4) | (9.6)
| | | | | |
_P. euthysanota | [Male] | 5 | 38.0 |48.8-52.0|50.0-57.1| 0-4
macrotympanum_| | | | (50.2) | (54.1) | (2.6)
| | | | | |
|[Female]| 5 | 44.8 |46.4-54.1|48.7-58.9| 8-10
| | | | (50.2) | (53.7) | (9.2)
| | | | | |
_P. leonhard | [Male] | 16 | 35.6 |48.8-56.1|48.7-61.9| 6-9
schultzei_ | | | | (51.2) | (52.1) | (6.5)
| | | | | |
|[Female]| 3 | 41.6 |52.3-59.5|47.5-48.6| 7-12
| | | | (54.7) | (48.1) | (9.5)
| | | | | |
_P. spinipollex_ | [Male] | 32 | 41.2 |46.9-53.1|45.0-55.2| 3-7
| | | | (49.0) | (49.5) | (4.9)
| | | | | |
|[Female]| 6 | 44.6 |46.1-50.2|47.7-53.8| 6-10
| | | | (48.8) | (50.4) | (7.6)
| | | | | |
_P. schmidtorum | [Male] | 25 | 32.8 |45.3-52.4|51.5-59.3| 5-11
schmidtorum_ | | | | (48.1) | (54.7) | (6.2)
| | | | | |
|[Female]| 9 | 38.0 |46.5-49.1|51.3-58.3| 7-11
| | | | (47.7) | (54.9) | (8.7)
| | | | | |
_P. schmidtorum | [Male] | 40 | 30.5 |46.0-51.9|48.2-65.6| 4-6
chamulae_ | | | | (48.2) | (54.9) | (4.7)
| | | | | |
|[Female]| 4 | 31.8 |48.1-52.4|51.4-61.7| 4-9
| | | | (50.5) | (55.7) | (6.2)
| | | | | |
_P. ignicolor_ | [Male] | 13 | 30.5 |45.9-52.2|37.1-47.1| 3-9
| | | | (49.6) | (43.2) | (6.1)
------------------+--------+------+-------+---------+---------+-------
[Illustration: FIG. 1. Palmar views of right hands of
(A) _Ptychohyla spinipollex_ (KU 58054) and
(B) _Ptychohyla schmidtorum schmidtorum_ (KU 58043).]
Many workers have used the presence of a bifid subarticular tubercle
beneath the fourth finger as a diagnostic character of certain species
of hylids. Examination of the subarticular tubercles in _Ptychohyla_
reveals considerable intraspecific variation. Bifid tubercles beneath
the fourth finger are found in all species except _P. ignicolor_,
which is known from only two specimens. In _P. euthysanota
euthysanota_ nearly 60 per cent and in _P. schmidtorum schmidtorum_
about 90 per cent of the specimens have a bifid tubercle beneath the
fourth finger on one or both hands. All specimens of _P.
leonhardschultzei_ have either a bifid or double tubercle beneath the
fourth finger, and some have a bifid distal tubercle beneath the third
finger.
FEET.--Members of the _Ptychohyla euthysanota_ group have a weak
tarsal fold, whereas in the species comprising the _Ptychohyla
schmidtorum_ group the tarsal fold is absent. Webbing on the foot
extends to the discs of the third and fifth toes and to the base of
the penultimate phalanx of the fourth toe, except in _P. ignicolor_,
which has less webbing.
VENTROLATERAL GLANDS.--Breeding males develop thickened, pigmented
glandular areas on the sides of the body. In living specimens of _P.
schmidtorum_ and _P. ignicolor_ the glands are not readily visible,
but in preservative they show as distinctive orange-colored areas.
These glands are most distinct in _P. euthysanota_; in many specimens
of this species the glands are elevated above the surrounding skin.
The extent of the glands is variable (Fig. 2); probably this
variability is due to different degrees of development in individual
frogs rather than to interspecific differences. All _Ptychohyla
ignicolor_ and some _P. schmidtorum chamulae_ have a small, round
glandular area on the chin; to my knowledge this does not occur in the
other species. Superficial examination of microscopic preparations of
the glands reveals no histological differences between species. The
glands occupy most of the thickened area and have narrow ducts leading
to the exterior. Detailed studies of the histology will be reported
elsewhere. Since the glands are developed only in breeding males, it
is surmised that the glands are associated with some phase of the
breeding activity.
[Illustration: FIG. 2. Normal extent of ventrolateral glands in
(A) _Ptychohyla euthysanota euthysanota_ (KU 58008),
(B) _Ptychohyla schmidtorum schmidtorum_ (KU 58037), and
(C) _Ptychohyla ignicolor_ (UMMZ 119603).]
TONGUE.--The shape of the tongue varies intraspecifically. Usually the
tongue is ovoid; in some specimens it is barely notched posteriorly,
whereas in others it is deeply notched, making the tongue cordiform.
Deeply notched cordiform tongues are found in _P. leonhardschultzei_
and _P. schmidtorum_; with the exception of these two species, some
individuals of all species have emarginate tongues. Some individuals
of all species have tongues that are shallowly notched posteriorly.