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Idia? - Idia americalis

Idia? - Idia americalis
Waltham, Middlesex County, Massachusetts, USA
September 28, 2008
Presuming I. americalis, but how is that separated from I. majoralis?

Thanks for the info. I added that to the majoralis species page. Not a great image, but I'll keep it for now as it's extending the flight season in MA.

Yes, your ID is correct, it is americalis. The differences to separate americalis from majoralis are as follows:

The subterminal line (nearer to the costa) of majoralis forms a more squared distad point - like a square protrusion, whereas in americalis it is more a of point, like a small bump.

Also, in americalis, there is a dark patch on the terminal border of the FW just below the apex, that is not present in majoralis. (It's a bit faint in your specimen, but definitely present)

Hope that helps.

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