Source : Webster's Revised Unabridged Dictionary (1913)

Sarcoptid \Sar*cop"tid\, n. (Zo["o]l.)
   Any species of the genus {Sarcoptes} and related genera of
   mites, comprising the itch mites and mange mites. -- a. Of or
   pertaining to the itch mites.

Source : WordNet®

sarcoptid
     n : whitish mites that attack the skin of humans and other
         animals; "itch mites cause scabies" [syn: {itch mite}]