Bulletin - United States National Museum - Smithsonian Institution

16 BULLETIN 17 7, UNITED STATES NATIONAL MUSEUM
A male (U.S.N.M. No. 74545) from Rio San Juan measm-es
61 mm. from snout to vent, and this seems to be about the maximum
size for males, the females averaging over one-fourth longer. The
males have very prominent external vocal pouches on each side of
the throat, while the inner surface of the thmnb is an enlarged, black,
horny patch. Some of the females from Rio San Juan, taken in
March, contain heavily pigmented eggs of approximately the same
size as those of the described specimen taken in December.
Occasionally a wider eyehd and a correspondingly narrower inter-
orbital width are found, but as a rule the eyeUd is conspicuously small
in this species.
Relationships.—Though it is obvious that the present species is
closely allied to the Cuban Hyla septentrionalis, the two are very
easily separable on leg length alone. The Hispaniolan form has the
tibiotarsal articulation reaching the tip of the snout, while the tibia
is more than half the distance from snout to vent. In the Cuban
form the tibiotarsal joint just reaches to the anterior corner of the
eye, while the tibia is less than half the length of the frog. The
interorbital width is noticeably less in the Cuban species, with a
corresponding increase in the size of the upper eyelid.
Specimens examined.—As listed in table 4.
Table 4.
—
Specimens of Hyla