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Horntails, Wood Wasps and SawfliesHey, about that bright yellow caterpillar…
Hey,
I ran into another one of the same kind today and I took it back for a picture so, disregard the previous email. But it’s this bright yellow caterpillar, found in the redwood forests of northern california (Humboldt County), and I think it was on an Alder tree. When I put it back, it seemed happy to be back on the trunk. I’ve never seen this before, so please help! I’ve already gone through your pages. Thanks
Katie Schmidt

Hi Katie,
Sawfly Larvae are often confused for caterpillars. This is a Cimbex Sawfly, and they are related to wasps.

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