a,
provides a morphological intergrade between _griseus_ and _ignavus_.
Accordingly, we arrange _ignavus_ as a subspecies of _griseus_; the name
of the animal from extreme eastern Panama should stand as _Bradypus
griseus ignavus_ Goldman, 1913.

~Cyclopes didactylus mexicanus~ Hollister

Hollister (Proc. Biol. Soc. Washington, 127:210, October 31, 1914) named
_Cyclopes mexicanus_, on the basis of light-golden upper parts and
large, especially broad, auditory bullae, as specifically distinct from
_Cyclopes dorsalis_ Gray (= _Cyclopes tridactylus dorsalis_ Gray). Our
comparisons and examination of the specimens used by Hollister and a few
other specimens acquired since 1914 convince us that _C. mexicanus_ is
taxonomically valid and that Hollister, in general, correctly indicated
its diagnostic characters. Nevertheless, there is considerable evidence
that _C. mexicanus_ is only subspecifically distinct from _C. dorsalis_.
In the first place, an adult _C. dorsalis_, not seen by Hollister, from
El Banco, Chiriqui, Panama (No. 248343 USBS), has more inflated,
although narrower, auditory bullae than do specimens of _C. mexicanus_.
In the second place, the two specimens mentioned by Hollister (_loc.
cit._) as from "Tabasco and southern Vera Cruz" actually are both from
Tabasco (No. 100040 USBS from Teapa, and No. 100174 USBS from
Montecristo). Each, as Hollister indicated, is darker on the upper parts
than his other referred specimens (two others from Montecristo in
Tabasco and another from El Salto in Chiapas). To us this suggests
intergradation with _C. dorsalis_. Incidentally, the specimen that
Hollister mentioned from Veracruz (No. 78111 USBS, from Minatitlan), and
that he indicated as having dark upper parts, really has light upper
parts. Third, a skin from Peten, Libertad, Guatemala (Harry Malleis
field No. 504, immature female), that the late Major E. A. Goldman
and one of us (Hall) once examined, has considerable dark brown on the
chin, throat and midventral line, as well as a dark mid-dorsal stripe.
The specimen is intermediate in color, as well as geographically,
between _C. t. dorsalis_ and _C. mexicanus_, although referable to the
latter. Taken together, the above evidence indicates subspecific status
for the northern, Mexican, animal and we conclude that it should stand
as _Cyclopes tridactylus mexicanus_ Hollister.

_Transmitted July 1, 1952._

End of the Project Gutenberg EBook of The Subspecific St