Aeshna subarctica (Odonata : Aeshnidae) in northwestern Wisconsin

Nine adult specimens of Aeshna subarctica, a boreal dragonfly typically ass ociated with muskeg wetlands, were collected from Black Lake and Breitzman Lake in northwestern Wisconsin (Douglas County). Viable populations likely exist in both lakes. Oviposition by three females is described. This repres ents the first published report of A. subarctica for the state of Wisconsin . Because Black Lake lies on the border of Wisconsin and Minnesota, A. suba rctica likely occurs in Minnesota as well. Further sampling of acidic peatl and habitats for aquatic macroinvertebrates is recommended to document popu lations of northern species at the southern periphery of their ranges. Thes e species could function as indicators of climate change.