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Grapeleaf Skeletonizer doesn't seem right... - Macremphytus testaceus

Grapeleaf Skeletonizer doesn't seem right... - Macremphytus testaceus
Saratoga Springs, Saratoga County, New York, USA
October 12, 2019
Size: not more than 6"L
A friend took this at my house. I had no control over the photo quality/ties. Its appears to be dining on Pressure-treated wood deck (is that frass below its left end?)
I say nay to the skeletonzier because, 1) this guy is not so obviously segmented as the pics I found 2) The black spots on my guy are much more irregularly shaped than the uniform shaped spots I see on Skel. examples here too. Finally, the skels. here appear to have some fuzziness/fuzzys. my guy seems awfully smooth. Because of the poor photo resolution I'm waiting to hear back about any fuzzy-ness and actual size. I don't know that particular rot on the deck s/he seems to be feeding from, so I can't hazard a guess on size. I sure hope it can handle the arsenic in that treated lumber. Thanks!

Moved from ID Request.

Sawfly larva
Something like this? Info page says "Larvae bore into wood in fall to pupate and overwinter."

are white pine and dogwood sawfly names for same 'pillar?
I got confirmation, no fuzzys and (human) thumb sized

Yurika, that pic/link goes to a page that certainly seems to be the same critter -- same general geo-region and time of year.

But the comments history are bit confusing. Is that title (white pine) the current accepted ID or was that from the OP's effort?. Can't see the head on mine. And why is it dining on dead wood -- ahaa, unless the decking is white pine... hmmm Last Instar does make sense, chubbiness and time of year.

"White Pine Sawfly"
Was OP's original ID and later corrected by expert. OP didn't (forgot to) change title.
Here is image of larva digging into deck post. I don't know why they do this though...

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