PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Vol. 106 Washington: 1956 No. 3364 CHIGGERS OF THE GENUS EUSCHONGASTIA ( ACARINA: TROMBICULIDAE) IN NORTH AMERICA^ By Charles E. Faurell-Introduction In this paper the systematics of the genus Euschongastm in North America are studied; 15 previously described species of Euschongastia are redescribed; four previously described species are synonymized ; nine new species of Euschongastia are de-scribed (one of these having been divided into two subspecies) ; the morphology, geography, and ecology are considered in de-scriptions; a key for North American Euschongastia is given; and the nomenclature of E. oregonensis (Ewing, 1929), E. californica (Ewing, 1925), and E. setosa (Ewing, 1937) are con-sidered. The author wishes especially to thank Dr. G. W. Wharton for his assistance throughout all phases of this work and Dr. H. S. Fuller for making available a manuscript copy of his paper on the Trombiculidae in the Oudemans collection that was published in ^ This paper is brsRd on a thesis submitted in partial fulfillment for the degree of Doctor of Philosophy, Duke University, Durham, N. C., in 1951. The investivratior'.s were sui)ported in part by a research grant to Dr. G. W. Wharton fi'om the Division of Research Grants and Fellowships of the National Institutes of Health, U. S. Public Health Service. =* Department of Biology, Vanderbilt University, Nashville. Tenn. 85
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