Loomis and Wrenn (1984, Pg. 152- 159 In Acarology IV, Vol. 1, Ellis Horwood Ltd., Chichester, UK) proposed a redefinition of the pest chigger genus Eutrombicula Ewing, 1938, stating that a number of records were misidentified and many new species remained to be named. Neither author survived to undertake a revision of Eutrombicula, but Wrenn had begun a study of the abundant pest chiggers of the eastern United States. Significantly, this genus includes a species, currently treated as E. alfreddugesi (Oudemans), that is the most frequent human-biting pest chigger in much of the eastern United States, although it has low host specificity and has also been recorded as an ectoparasite of a variety of amphibians, reptiles, birds, and other mammals (Wharton and Fuller 1952, Mem. Entomol. Soc. Wash. No. 4; Loomis 1956, Univ. Kansas Sci. Bull. 37:1195 - 1443; Loomis and Wrenn 1984).

Originally, a single widely distributed species...

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