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Elm sawfly. This is a very large species of Hymenoptera, with adults measuring 3 cm and larvae reaching 5 cm long. If captured, adults may buzz and use their powerful spiny legs defensively. However, like other sawflies, this species does not possess a sting.

en.wikipedia.org/wiki/Cimbex_americanus

 

Many thanks to dave dube' who helped find the name of these insects!

 

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Uploaded on March 12, 2025
Taken on March 4, 2025