specimen has the basal third of the tail black and the toes are
all black. In the sum total of their characters the specimens mentioned
above are referable to _Didelphis marsupialis pigra_. These five
specimens, and indeed the three from Deming Station alone, show
intergradation in coloration of the feet between _Didelphis marsupialis
texensis_ and _Didelphis virginiana pigra_. Probably there is three-way
intergradation here at Deming Station in that _D. v. virginiana_
immediately to the north is involved. The specimens mentioned above,
along with the information recorded by Davis (_loc. cit._) and other
authors (for example, J. A. Allen, _loc. cit._, and Bull. Amer. Mus.
Nat. Hist., 16:249-279, August 18, 1902), give basis for arranging the
North American _Didelphis_ as follows:

_Didelphis marsupialis virginiana_ Kerr.

1792. _Didelphis virginiana_ Kerr, Animal Kingdom, p. 193, type
locality Virginia.

_Didelphis marsupialis pigra_ Bangs.

1898. _Didelphis virginiana pigra_ Bangs, Proc. Boston Soc.
Nat. Hist., 28:172, March, type from Oak Lodge, opposite Micco,
Brevard Co., Florida.

_Didelphis marsupialis texensis_ J. A. Allen.

1901. _Didelphis marsupialis texensis_ J. A. Allen, Bull. Amer.
Mus. Nat. Hist., 14:172, June 15, type from Brownsville,
Cameron County, Texas.

_Didelphis marsupialis californica_ Bennett.

1833. _Didelphis Californica_ Bennett, Proc. Zool. Soc. London,
p. 40, May 17, type probably from northwestern part of present
Republic of Mexico.

1924. _Didelphis mesamericana mesamericana_, Miller. Bull. U.S.
Nat. Mus., 128:3, April 29, 1924, and authors. Type locality,
northern Mexico. (_Did[elphys]. mesamericana_ Oken, Lehrbuch d.
naturgesch., pt. 3, vol. 2, p. 1152, 1816, along with other
names from Oken 1816, is judged to be unavailable under current
rules of zoological nomenclature.)

_Didelphis marsupialis tabascensis_ J. A. Allen.

1901. _Didelphis marsupialis tabascensis_ J. A. Allen, Bull.
Amer. Mus. Nat. Hist., 14:173, June 15, type from Teapa,
Tabasco.

_Didelphis marsupialis yucatanensis_ J. A. Allen.

1901. _Didelphis yucatanensis_ J. A. Allen, Bull. Amer. Mus.
Nat. Hist., 14:178, June 15, type from Chichenitza, Yucatan.

_Didelphis marsupialis cozumelae_ Merriam.