cariacus columbianus
Webster's Dictionary (GCIDE)
Blacktail \Black"tail`\, n. [Black + tail.]
1.(Zool.) A fish; the ruff or pope. [1913 Webster]
2.(Zool.) The black-tailed deer (Cervus Columbianus or Cariacus Columbianus) of California and Oregon; also, the mule deer of the Rocky Mountains. See Mule deer. [1913 Webster]