References

Berger, C.  2004.  Dragonflies: Wild Guide.  Stackpole Books, Mechanicsburg, PN.

Dunkle, S W.  2000.  Dragonflies Through Binoculars: A Field Guide to Dragonflies of North America.Oxford   University  Press, Oxford, N.Y.

Encyclopedia of Life 2013. <URL: http://eol.org/pages/1034051/overview

Haarstad, J. 1997. The dragonflies of selected eastern Minnesota rivers. Report submitted to the
Minnesota Department of Natural Resources.

IUCN Red List of Threatened Species 2009. <URL: http://www.iucnredlist.org/details/165022/0> Accessed 21 February 2013.

Minnesota Department of Natural Resources 2013. <URL: http://www.dnr.state.mn.us/rsg/profile.html?action=elementDetail&selectedElement=IIODO12180

Silsby, J. 2001. Dragonflies of the world. Smithsonian Institution Press, Washington, D.C.

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.

Vogt, T. E., and W. A. Smith. 1993. Ophiogomphus susbehcha spec. nov. from North Central United States (Anisoptera:  Gomphidae). Odonatologica 22:503-509.

Wisconsin Department of Natural Resources 2013. <URL: http://dnr.wi.gov/topic/endangeredresources/animals.asp?mode=detail&speccode=iiodo12180