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Turtle River State Park, Grand Forks County, North Dakota, USA
June 25, 2013
These were all found on an old box elder (Acer negundo) stump that a pileated woodpecker has been working for the past two years. Are these two different species? Or male vs female?

Moved from ID Request.

you have females of 2 species and males in the group shot. They should be submitted separately.

Wonderful. So I can leav

So I can leave the group shot here, and separate the others as two new entries?

I'm guessing then that the female w/ the more mottled body markings is separate from the female w/ the more solid body and yellow head?

ETA: Probably didn't separate them in the proper technologically proficient manner, but using Ross's ID's got all of the females sorted together.

Megarhyssa males…
On the left is a clump of Megarhyssa atrata males. On the lower right are males of either M. macrurus or M. greenei (difficult to be sure from this image).

See reference here.

M. greenei get this far north
M. greenei get this far north?

Megarhyssa greenei has apparently not been recorded from North Dakota. However, the map of Townes & Townes, 1960 does record the species from northwestern Minnesota. I would presume, although I really don't know if it has been verified, that the female hormone of a species of Megarhyssa only attracts conspecific males. Although the wing marking isn't clearly visible in most of these males, I expect that they are all Megarhyssa macrurus being attracted to a female that is ready to emerge. Males will try to mate with the female before she even emerges by inserting the abdomen into the emergence hole. There are no females visible in this photo.

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