Late Pleistocene zoogeographic shifts and new collecting records for Helophorus arcticus Brown (Coleoptera: Hydrophilidae) in North America

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Abstract
Helophorus arcticus Brown is a rare hydrophilid beetle, previously known from localities in subarctic and eastern Canada. New sites, including the first record for the province of Quebec, are described with the modern habitats, and climatic records are provided for the known range of the species. Fossil specimens of H. arcticus are known from both early and late Wisconsinan sites in southern Canada and the northern United States. The movement of the species is hypothesized from the last (Sangamonian) Interglacial to the present together with potential new collecting areas in subarctic North America.

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