Papers in the Biological Sciences


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Published in Transactions of the American Microscopical Society, Vol. 29, No. 2 (December 1910), pp. 97- 110.


Since the publication of "The Arrhenuri of the United States," in 198, the author has been fortunate enough to secure enough more material to justify the publication of a supplementary paper on this large genus of water-mites. This material consists of collections from new localities in the United States, and of additional material from old collecting grounds, together with a few specimens from other countries. The author's own collections were made in Wisconsin and Illinois. A few new places were visited, as the lakes about Milwaukee ; and more extensive collections were made in previously known bodies of water, as Lake Wingra, Mirror Lake, Lake Spooner, Wisconsin, and the Illinois River at Havana. As a result, several hundred more Arrhenuri have been studied, representing twenty-eight species; the habitats of eleven species have been extended beyond state lines, and three new species have been added to the genus, while four more females have been identified.

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