Collohmannia johnstoni n. sp. (Acari, Oribatida) from West Virginia (U.S.A.), including description of ontogeny, setal variation, notes on biology and systematics of Collohmanniidae
  System of the Phthiracaroidea (Oribatida, Euptyctima)
  The immature stages of two genera of Oribotritiidae (Oribates)
  New observations on Oribatids (5th serie)