What is this bug?

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cinari

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Noticed a bunch of these on a birch last fall. Have not seen them before or since, but wondering what they are and if there’s anything I should do to prevent them from returning if they are harmful.
 

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Let us not forget that they're wonderful predatory insects that eat the bad guys. Lacewing larvae look kinda similiar but tend to not be as colorful as the many kinds of lady bugs ones.

So...don't "deal" with them.
 
That looks like Harmonia axyridis and both the larvae and adult eat aphids, scale insects, etc. and are beneficial insects. Be glad you have them.
 
Yes, aside from their nuisance nature getting into homes during the fall, they are mostly beneficial. Neighbor had an aphid infestation on a maple, but these little buggers took care of them.
 
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