Illinois Butterfly Monitoring Network
Juvenal's Dusky Wing (Erynnis juvenalis)
Illinois Beach State Park, Lake County, Illinois
Photo by Donna Motherway
This picture could be either a Juvenal's or a Horace's Dusky Wing. We're missing two key pieces for accurate identification: the date the picture was taken and a view of the underside of the hindwing.
Juvenal's is univoltine and flies from mid-April through early June; Horace's is bivoltine and can be found in early spring and again from late June through September. If the picture was taken in July or later, we could confirm it as a Horace's. If we saw two white spots on the underside costal edge of the hindwing, we could confirm it as a Juvenal's Dusky Wing.
With only the photo and no additional information, we are left with some doubt.
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