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. 



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