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This is a black walnut tree. My brother noticed them while we were in the backyard. I have other trees that are not black walnut and do not see these bugs on them.

They are red with a black head. Their bodies have ridges on them. It's hard to tell because they are so small. Closer to a large grain of salt, or small piece of rice.

Mystery bug

Update: This is from Northeastern Oklahoma area. They have since disappeared. I'm not sure if the heat got to them or they turned into something else or what.

  • Its impossible to tell if these creatures have legs or not or whether they're larvae - do they and if so, how many? Is the tree healthy - there seems to be quite a lot of loose bark? – Bamboo May 20 '18 at 2:24
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This is a stab in the dark...Scarlet Malachite Beetle larvae. The size wasn't specified but red larvae with black head should be rare...ish? Scarlet Malachite

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It would help if you told us where you are situated. However, they are likely to be cardinal beetles, possibly larvae feeding under the tree bark. Totally harmless cardinal beetles

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Although I think stormy has a point about the odds of finding more red larva with black heads, I discovered another larva possibility: the walnut caterpillar (Datana integerrima), which seems to be a considerable walnut pest; so, I thought it might be likely.

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