western leaf-footed bug

Description:

These bugs were extremely thick on Utah junipers and seemed almost aggressive. I walked next to a juniper and a whole swarm of these came flying off. I thought I was getting attacked by a bee swarm at first. They didn't actually land on me they just flew around like crazy! I was thinking they must have been mating or something because it seems like there are two different looking bugs in the photo.

Habitat:

These bugs were found exclusively on Utah juniper. Big sagebrush, herbs and grasses were at the spotting site as well but they were bug-free.

Notes:

Thanks to ForestDragon for the recommendation.