Saturday, September 14, 2013

Spotted Spreadwing

Scott King pointed out to me Spotted Spreadwings at St. Olaf College. These lovely, dark, blue-eyed damselflies are perhaps the latest fliers of the year (at least among the spreadwings). They reach their peak abundance in September and sometimes last into October (DuBois).
Identification is cinched by noticing the two dark spots on the underside of the thorax (the main body of the spreadwing). The spots are evident in the bottom photograph. This species is found across northern North America, and further south on the West Coast and the Appalachian Mountains. Despite this spreadwing’s often being found in high densities, this observation was my first for the species.

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