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Georgia River Cruiser? - Macromia alleghaniensis - male

Georgia River Cruiser? - Macromia alleghaniensis - Male
Atco, Camden County, New Jersey, USA
June 8, 2011
Size: 35mm?
Macromia illinoiensis georgina?

Looks like this one

Moved from Macromia.

Thank you, Ben!
There is no Macromia alleghaniensis in this checklist Is that OK?

It appears it may be a Camden County record. You could try submitting it to Odonata Central. You have to register at the site first, but it is easy to do. Bear in mind records sometimes get vetted as unconfirmed due to a lack of sufficient diagnostic photographs. But it's worth a shot. Compare the submitted record of alleghaniensis from New Jersey to your photo.

Moved from Dragonflies.

Do you have a lateral view?

I don't. It was on high branch (and I'm short!) and I only could take picture from this angle...

Allegheny v. Georgia
I'm not sure that you can rule out Macromia alleghaniensis from just this view. M. i. georgina has half-length antehumeral stripes, which alleghaniensis should essentially lack. Georgia also averages more yellow, with larger abdominal spots, but differs in some of the fine details. The keel on the middle tibia of the male is 14-20% of total length on alleghaniensis and 25-50% on georgina (Dunkle 2000). The small size of the abdominal spotting and the interrupted band on S2 makes me lean more towards an Allegheny, but almost all of the diagnostic marks you would need to confirm without capture require a lateral view. I'll mull this over and check back.

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