The Collaborative International Dictionary of English v.0.48:

Trachearia \Tra`che*a"ri*a\, n. pl. [NL.] (Zool.)
   A division of Arachnida including those that breathe only by
   means of tracheae. It includes the mites, ticks, false
   scorpions, and harvestmen.
   [1913 Webster]