Abstract
House flies, Musca domestica (L.), were trapped from mite-infested dairy cattle manure and collected by net inside dairy barns. Macrocheles muscaedomesticae (Scopoli) and M. subbadius (Berlese) were commonly found attached to the house flies. Although M. medarius (Berlese), M. robustulus (Berlese) and Glyptholaspis confusa (Foà) were present in the manure, only 1 specimen of each of the first 2 species and none of the third were found attached to a house fly. In a comparison of the behavior of macrochelids from laboratory colonies, M. muscaedomesticae and M. subbadius were phoretic on the house fly and the other 3 species were not.

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