hat there is nothing distinctive, in the
specific sense, in the cranial measurements which Matschie published
(_op. cit._). _M. canus_, therefore, may be merely an intergrade
between the two previously named woolly opossums (_C. d. centralis_ and
_C. d. pallidus_), an individual variant of a previously named kind,
say, _C. d. pallidus_, or a valid subspecies. If it is a recognizable
subspecies, it probably comes from somewhere in the eastern half of
Nicaragua. As a means of handling the name, _Micoureus canus_ Matschie,
we tentatively place it as a subspecies of the species _Caluromys
derbianus_. The name may, therefore, stand as _Caluromys derbianus
canus_ (Matschie), with type locality in Guatemala.

~Caluromys derbianus fervidus~ (Thomas)

Elliott (Field Columb. Mus. Nat. Hist., Publ. No. 115, Zool. Ser., 8:5,
1907) lists as _Caluromys laniger pallidus_ a specimen from Honduras
that was acquired for the Field Columbian Museum (= Chicago Natural
History Museum) by purchase from Ward's Natural Science Establishment
of Rochester, New York. On August 4, 1951, in the Chicago Natural
History Museum, we found in the catalogue of the collection of Recent
mammals an entry for a male _Caluromys_ bearing catalogue number 6 and
listed as from "San Pedro Sula [Honduras]. From Wards. Mounted". In the
collection of study specimens there is no specimen from Honduras that
was purchased from Ward's, mounted or unmounted. In the sealed,
glass-fronted, exhibit cases of mammals on display there is one, and
only one, _Caluromys_. It is presumed to be specimen No. 6. This
specimen is not _C. d. pallidus_ because it is too dark. It could be
_Caluromys derbianus fervidus_ and we tentatively refer it to that
subspecies.

~Caluromys derbianus pallidus~ (Thomas)

From Puntarenas, Costa Rica, Harris (Occas. Papers Mus. Zool. Univ.
Michigan, 476:7, October 8, 1943) listed as _Caluromys laniger
centralis_ a female, skull and skin, No. 62702 in the Museum of Zoology
of the University of Michigan. We have examined this specimen, the
color of which is darker than in some other specimens of _C. d. pallidus_
but lighter than that of specimens of _C. d. centralis_ (for example,
specimens from Turrialba, Costa Rica) and on basis of color we refer No.
62702 to _Caluromys derbianus pallidus_.

~Scalopus aquaticus aereus~ (Bangs)

Bangs' (Proc. Biol. Soc. Washington, 10:138, December 28, 1896) name
_S. a. aereus_ was based on a single specimen