329 (old No. 7842). The
skull has been broken in two through the interorbital region but is
glued together.

Of _R. tumida_, no additional specimen has been saved, so far as I know,
from the type locality, Mirador, Veracruz.

Of _R. parvula_, Nelson and Goldman, on May 19, 1897, on Maria Madre
Island, saved in alcohol an additional specimen (92413 U.S.N.M.) from
which J. Biggs, Preparator at the National Museum, in 1951, removed and
cleaned the skull. In small size and in all other features, the skull of
92413 closely resembles those of specimens saved by Alcorn from the
adjoining mainland of Mexico in Sonora and Nayarit. The pelage of the
upper parts of 92413 could be described as "of a light greyish-brown at
basal third, fawn-chestnut-brown at apical two-thirds" which are the
words that H. Allen (_op. cit._: 285) used to describe the pelage of his
_R. parvula_. The external measurements of 92413 are: total length, 60;
length of tail, 25; length of hind foot, 5.5; and ear from notch, 11.0.
The first two measurements are slightly smaller than the corresponding
measurements of any other specimen seen. Nevertheless, the measurements
(tail, 30.5; hind foot, 5.3 [after H. Allen, orig. descr.]) of the
holotype of _R. parvula_, also from the Tres Marias Islands, show that
it was as large as no. 39724 from the adjoining mainland (see table 1).

According to the original descriptions, _R. parvula_ and _R. tumida_
differ in size, _R. parvula_ being the smaller. As may be seen from
table 1, the alleged type of _R. tumida_ and the alleged paratype of _R.
parvula_ indicate the opposite! All specimens obtained since the time of
the original descriptions, as may be seen by inspecting table 1, support
the correctness of the original descriptions. Therefore, and also
because of the other information presented above, I am inclined to the
opinion that the holotype of _R. tumida_ and the paratype of _R.
parvula_ have been switched; each now is associated with the name and
data, at least for locality, of the other.

Other opinions are that _Rhogeessa_ from the Tres Marias Islands average
smaller than _Rhogeessa_ of the adjoining mainland of western Mexico but
not enough smaller to warrant subspecific separation of the two.
Specimens from places geographically intermediate between the geographic
ranges, as now known, of _R. parvula_ and _R. tumida_ probably will
reveal intergradation between the two kinds, which, therefore, should
stand