THE UNIVERSITY OF KANSAS SCIENCE BULLETIN Vol. XL] April 20, 1960 [No. 8 A Revision of the Mite Family Bdellidae in North and Central America (Acarina, Prostigmata) BY Warren T. Atyeo Abstract. This study, although primarily a monographic revision, includes data on the bionomics, morphology, and intraspecific variation of the bdcllids. Eleven genera are recognized, including a new genus Octohdellodes; four gen-era or subgenera are synonymized, these are: Caenohdella Oudemans, 1937 (=: Bdella), Troglobdella Oudemans, 1937 (^Cyta), Hoplomolgtis Bcrlese, 1923 (= Neomolgus), and Hoploscirus Thor, 1937 {= Bdellodes). Thirty-two species are included in this paper, of which sixteen are new. Four species are moved to other genera, and thirteen species, for which type' materials arc available, are sonymized. For other synonymies, Thor ( 1931 ) is recognized. The sixteen new species described are: Bdella longistriata, B. tropica, Bdellodes hisetosa, Cyta spuria, Neomolgus rnutahilis, Octohdellodes hurdi, O. infrequens, Odontoscinis iota. O. alphinus, Thoribdella communis, T. insolita, T. simplex, T. spiuosa, T. communis, Spinihdella bifurcatci, S. ornata. TABLE OF CONTENTS Introduction 346 Acknowledgments 346 Collection of Material =. 347 Preparation of Material 347 Geographical Distribution 348 Bionomics 349 Morphology 351 General 351 Segmentation of Appendages 351 Setae 352 Chaetotaxy of the Legs 353 Gnathosoma 355 Propodosoma 357 Dorsal I l>ster<)soma 358 Anal Hcgion 359 Genital Region 359 (345)