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Over 200 species of mites heve been coliected from passalid beetles (Passalidae). This representa collections from oniy a small portion of the kno\A/n passaiids. The mites are distributed among 21 families and 68 genera. Six of these famiiies occur oniy in association \A/Ith passaiids. The largest number of mitee associated \A/ith passaiids belong to the taxonomic group Mesostigmata, supercohort Trigynaspida. Species of t\A/o mite families live on the beetle in a parasitic orcommensal relationship. The remaining families have a phoretic association \A/ith the beetles, using the beetles for transportation to new habitats. Species of nine of these mite families are not common on passaiids, and are probably opportunitic phoretics on the beetle. Studies suggest that \A/hen oniy the female disperses these mites reproduce parthenogenetically, but \A/hen both sexes disperse mating takes place after dispersal. Various methods of holding onto the beetle have evolved among the different mite groups. Mites partition riding space on the beetle and reproductiva areas of the beetle tunnel, thus reducing or eliminating competition. Data suggests that mite-beetle host specificity is rarely a 1:1 relationship. Specificity is possibly beetle habitat relatad, e.g., beetles \A/hich live under the bark versus beetles v\/hich live deeper in the log. Mitas of 17 families have been coliected from Ne\A/ World passaiids. Taxonomic keys to these families and genera, characters for family recognition, tha number of species kno\A/n from passaiids, and comments on these species are inciuded for mites from New World passatid beetles.

MITES ASSOCIATED WITH NEW WORLD PASSALID BEETLES (COLEOPTERA: PASSALIDAE)