Ontogeny of Rhyncoptes grabberi, n. sp. (Acari: Astigmata: Rhyncoptidae) associated with Macaca mulatta

All ontogenetic stages of a new species of follicle mite, Rhyncoptes grabberi, n. sp., associated with rhesus monkeys, Macaca mulatta, are described and illustrated. The ontogeny of the new species is characterized by numerous retardations and losses of ancestral transformations, especially in the female developmental line. In the male developmental line, many transformations are delayed to the male itself.