Elm Sawfly (Cimbex americanus), larva, feeding on River Birch, family Cimbicidae, Montgomery County, TX, USA
photograph by Paxon Kale CC

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Elm Sawfly (Cimbex americanus), larva, feeding on River Birch, family Cimbicidae, Montgomery County, TX, USA
photograph by Paxon Kale CC

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Birch sawfly/Cimbex femoratus/stor klubbhornstekel aka bjΓΆrkbladstekel. VΓ€rmland, Sweden (11 July 2020).
Elm Sawfly? Had the pleasure of meeting one recently and they're gorgeous little dudes!
Wow, I'm jealous! Gotta love a sawfly.
Have you seen the elm sawfly (Cimbex americanus)?
I have now
Yes, in photos/videos
Yes, irl
I'm not sure
My first thought after saw this fly : a most thickest and brutal looking hornet I've ever seen
Almost big as Asian giant hornet. The definition of robust!
Birch Sawfly (Cimbex femoratus)
Corynis obscura is a tiny sawfly that i've exclusively found sleeping on small geraniums like this one for whatever reason. independently of whether geraniums are their host plant or just have really comfortable flowers, i'm not sure when these things are supposed to be active if i find them knocked out at 3pm
(April 11th, 2025)

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assorted wasps
Cimbicid sawfly larvae, by Anne Sorbes.
wasp of the week!
August 8th
Birch Sawfly (Cimbex femoratus)
while these guys may look intimidating with their deep maroon abdomen colors, they cant sting at all! no sawflies can sting, but they do have these saw like appendages used to cut into trees where they lay their eggs. Birch sawfly larvae is almost impossible to differentiate from a normal caterpillar to the average person, but if you are reading this then i doubt you are. these guys are widespread throughout europe and siberia, so if you are in that area, search for some strange looking caterpillars and maybe they wont be caterpillars at all :)