That looks like the right call. Bugguide lists 4 species of Trichiosoma, and only one of them is found in NY, T. triangulum. http://bugguide.net/node/view/41490
Hi Rieko. That Trichiosoma picture certainly looks similar - but I really don't know sawflies well enough to say much more than that. Hopefully someone who knows more about them will pitch in.
@John La Salle: Thank you so much for your kind help.
Under your information, I checked BugGuide and I think it is called Trichiosoma triangulum. If I am wrong, please correct me. http://onh.eugraph.com/insects/hymenop/sawfly/trichiosoma/index.html
I also posted attached below last year. Now, I know that they are associated.
http://www.projectnoah.org/spottings/35796017
This is a sawfly
http://en.wikipedia.org/wiki/Sawfly
If my memory serves me correctly it could be a Cimbicidae because of those lovely clubbed antennae
http://en.wikipedia.org/wiki/Cimbicidae
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