Source : Webster's Revised Unabridged Dictionary (1913)

Stagworm \Stag"worm\, n. (Zo["o]l.)
   The larve of any species of botfly which is parasitic upon
   the stag, as {[OE]strus, or Hypoderma, act[ae]on}, which
   burrows beneath the skin, and {Cephalomyia auribarbis}, which
   lives in the nostrils.