yarit, and southern Sinaloa. Near Oaxaca, Oaxaca, specimens were
collected that superficially resemble those from Michoacan and farther
north. These have low keels on the snout scales, dorsals somewhat larger
than the ventrals, and a pink throat fan. In ten males from Oaxaca the
size of the dorsal scales relative to that of the ventrals is 1.00:0.83;
the same ratio for 25 males from Michoacan is 1.00:1.08. In both samples
there are specimens in which the dorsal and ventral scales are about
equal in size.

Investigations by Richard E. Etheridge on the osteology of _Anolis_,
including those species here being considered, have revealed relatively
constant differences in the parasternalia and in the caudal vertebrae.
The application of Etheridge's findings to anoline systematics must
await the completion of his study.

The carination of the scales on the snout _versus_ smooth scales there
seems to be the only significant character given by Bocourt that
distinguishes _A. Nebuloides_ from _A. nebulosus_. The difference in the
color of the throat fan, which is apparent only in living individuals,
is more striking. Obviously more than one species is represented, as is
borne out by the differences in the color of the throat fan and in the
osteology, but there is uncertainty about the correct name for each
species. On the strength of Bocourt's diagnosis of keeled snout scales
in _A. nebuloides_, I am applying that name to the population in Oaxaca
and _A. nebulosus_ to the specimens from Michoacan. As arranged here,
the two species can be distinguished, as follows:

_A. nebulosus._--Dorsal scales only slightly smaller than
the ventral scales; snout scales usually smooth; throat-fan
bright orange in adult males.

_A. nebuloides._--Dorsal scales somewhat larger than the
ventral scales; snout scales having a low keel; throat-fan
pink in adult males.

With respect to geographic distribution, _A. nebulosus_ has been
collected from southern Sinaloa southward to Michoacan. The lizards here
referred to _A. nebuloides_ have been taken only in pine-oak forest on
the mountain slopes near Oaxaca City. Zweifel and Norris (1955:233)
reported anoles with pink throat-fans from southern Sonora; possibly
those specimens are _A. nebuloides_; I have not examined them. I have
seen several preserved specimens from the vicinity of Tehuantepec,
Oaxaca. Although they probably belong to this group, those specimens
differ