Abstract
Four new species of the genus Klinckowstroemia are described, all obtained from passalid beetles collected in Mexico and Panama. The species are: Klinckowstroemiapennula, sp. nov., K. melissae sp. nov., K. stilla sp. nov., and K. oconnori sp. nov. Wefound two instances where different mite species inhabited the same host, K. pennula, and K. melissae on Pseu-dacanthus sp., and K. pennula and K. candidoi on Oileus bifidus. This is the first record of the genus Klinckowstroemia from Panama. An updatedkey for the 24 species of Klinckowstroemia is presented.