Explanation of Names
Author of species is Hagen, 1861.
Identification
Two black spots on the latero-ventral surface of the thorax are diagnostic and give the species its common name; thorax black dorsally.
Range
most of North America except southeastern states (LA FL GA SC NC)
Habitat
margins of ponds, marshes, swamps and sometimes slow-moving water
Season
latest of the spreadwings; late summer through fall, sometimes into November
Print References
Abbott, p. 36 , photos 2d, 2e
(2)
Internet References
scanned adult images of male and female (U. of Puget Sound, Washington)
live adult images and other info (Stephen Cresswell, West Virginia)
live adult images and other info (Ed Lam, New York)
live adult images (Arizona Odonates)
live adult images and other info (njodes.com)
distribution map - North America (Green Mountain College, Vermont)
distribution list by state/province/territory (Bill Mauffray, Florida)
Odonata of North America, Updated September 2007