_Epitedia wenmanni_ was found on the white-footed mouse (_Peromyscus
leucopus_) and only rarely on the prairie vole. _Corrodopsylla
hamiltoni_ was taken only from the two kinds of shrews (_Blarina
brevicauda_ and _Cryptotis parva_). Fleas on shrews may have a
well-developed host preference. At any rate, Elton, Baker, Ford, and
Gardner (1931) found that _Doratopsylla dasycnemus_ rarely strayed from
its normal host (_Sorex araneus_) to other small mammals.
_Peromyscopsylla scotti_ was taken from the white-footed mouse
(_Peromyscus leucopus_), and had a habitat preference also. It was found
only on those white-footed mice which were trapped in the woodlands at
various places in Douglas County; white-footed mice which were trapped
in areas of brush were free of this parasite.