The Collaborative International Dictionary of English v.0.48:

Upsarokas \Up`sar*o"kas\, n. pl. (Ethnol.)
   See Crows.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crows \Crows\ (kr[=o]z), n. pl.; sing. Crow. (Ethnol.)
   A tribe of Indians of the Dakota stock, living in Montana; --
   also called Upsarokas.
   [1913 Webster]