em
probably marginal habitat for the species.

_Unverified species._--If the 10 species listed as of "unverified
occurrence," it seems highly likely that as many as eight will be found
to occur, or occurred within historic time, in Harding County. Among
these eight are one steppe species (_Vulpes velox_), three with
boreomontane affinities (_Sorex cinereus_, _Gulo gulo_, and _Lynx
canadensis_), two (_Sciurus niger_ and _Urocyon cinereoargenteus_) that
are associated with the eastern deciduous forests, and two (_Sorex
merriami_ and _Lagurus curtatus_) that are Great Basin elements.

It is noteworthy that the last-mentioned faunal unit is not known to be
represented in northwestern South Dakota.

ACKNOWLEDGMENTS

For assistance in the field, we are especially grateful to the students
who were enrolled in the Field Course in Vertebrate Zoology at The
University of Kansas in the summers of 1961, 1965, and 1970, and to M.
A. Levy, R. R. Patterson, and T. H. Swearingen. In 1965 and 1970, the
summer field course was supported in part by grants (GE-7739 and
GZ-1512, respectively) from the National Science Foundation; Andersen
was supported in the field in 1968 by a grant from the Kansas City
Council for Higher Education. Personnel of the U.S. Forest Service
(Sioux Division, Custer National Forest), particularly District Ranger
Timothy S. Burns, were most helpful to us in the field, as were Wardens
Wesley Broer and Merritt Paukarbek of the South Dakota Department of
Game, Fish and Parks. Robert Kriege, Federal predator control agent
stationed in Buffalo, was most generous in sharing with us his knowledge
of rodents and carnivores in the area, and many present or former
residents, particularly Carl Cornell and Spike Jorgensen, also provided
useful information and were helpful in other ways.

Ectoparasites reported here were identified by Cluff E. Hopla (fleas),
Richard B. Loomis (chiggers), and Glen M. Kohls (ticks). Other than
mammals housed in the Museum of Natural History, we examined only three,
two in the U.S. National Museum (USNM) and one in the collection at
South Dakota State University, Brookings (SDSU).

LITERATURE CITED

ANONYMOUS

1959. Building an empire: a historical booklet on Harding County, South
Dakota. Buffalo Times-Herald, 108 pp.

BAILEY, V.

1915. Revision of the pocket gophers of the genus Thomomys. N. Amer.
Fauna, 39:1-136.

1927. A biological survey of North Dakota. N. Amer. Fa