AC′ARI

(-rī). [L.; prim. Gr.] Syn. Acar′idans ; Acar′ides (dēz); Acarid′iæ . (-e-ē). In entomology , a division of arachnidans, including the mite and tick . All the species are either microscopic or extremely minute, and po e such tenacity of life as to resist for some time the action of boiling water, and to live with comparative impunity in alcohol. Leuwenhoek had one that lived eleven weeks glued on its back to the point of a needle, without food. The following are well known— ACARUS AUTUMN A′LIS , the harvest-bug or wheal-worm ; A. DOMES′TICUS , the domestic tick ; A. DYSENTE′RIÆ , the dysentery-tick ; A. FARI′NÆ , the meal mite (fig. a ); A. RI′′CINUS (rĭc-), the dog-tick ; A. SAC′CHARI , the sugar-mite (fig. b ); A. SI′′RO , the cheese-mite (fig. c ); A. SCABIE′I , the itch-insect (fig. d ). The irritation of the skin, caused by these vermin, may be relieved by a lotion of equal parts of sal volatile and water; and they may be destroyed by tobacco water, or a lotion or ointment of stavesacre. See Itch , Mange , Parasites , Pediculi , Scab , .