Abstract:
Adults of Bandakia hoffmannae sp.nov., Bandakia mexicana sp.nov., Chappuisides notialis sp.nov., and Neoacarus adocetus sp.nov., all collected in the mountains west of Mexico City, are described. These are the first reports of species of these three essentially holarctic genera from south of the United States border in North America. These discoveries provide new insight concerning the extent of refugial areas for fresh-water arthropods in southern North America during the Pleistocene.