Steffens, W.P. and W.A. Smith. 1999. Status survey for special concern and endangered dragonflies of Minnesota: population status, inventory and monitoring recommendations. Final report submitted to the Natural Heritage and Nongame Research Program, Minnesota Department of Natural Resources. 54 pp.
Status determination surveys for Hine's emerald dragonfly (Somatochlora hineana), Saint Croix snaketail (Ophiogomphus susbehcha), and extra-striped snaketail (O. anomalus) were conducted throughout eastern, central, and northern Minnesota. Threats to these rare species were evaluated, and conservation and population status recommendations for Minnesota dragonflies are presented. Baseline data on other dragonflies in under-surveyed habitats are reported, including several state records and numerous county records. Several collections of damselflies are also reported along with county distribution information, and recommendations for future Odonata surveys and monitoring are offered.