Box Elder Bug nymph

mystery bug
We have these in numbers in the back yard and are not sure that they are. I was thinking it was a type of chinch bug but I have not been able to verify. If you could help I would appreciate it.
Thanks allot,

Hi Rick,
You have an immature or nymph stage Box Elder Bug. Both nymphs and adults congregate together in large aggregations often on Box Elder and Maple trees, but also on other deciduous trees. They are usually noticed in fall and warm winter day. They sometimes enter homes in great numbers.

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