That is an elm seed bug (Arocatus melanocephalus). They are relatively new invasive pest of now found in Wyoming. The University of Idaho has an excellent fact sheet on them as they have had them in their state much longer. You can access it at this web address. https://www.extension.uidaho.edu/publishing/pdf/CIS/CIS1223.pdf
If you have additional question that are not answered by the fact sheet I will be happy to try and answer them.