NEW SPECIES OF EUZERCON BERLESE FROM MEXICO WITH A KEY TO THE NEW-WORLD SPECIES (ACARINA, MESOSTIGMATA, EUZERCONIDAE)

Euzercon mites live in the galleries of passalid beetles (Passalidae) and adults are phoretic on the adult beetles. Until now, the genus includes four species, two from the New World, and two from the Old World. Four new species - E. anatonon, E. subtermion, E. dolichos and E. brachys - collected from passalid beetles in Mexico, are described and illustrated, and E. hyatti nom. nov. is proposed for E. balzani described by HYATT, 1964. A generic redescription and a key to the adults of the New World species are given.