Beardtongue is one of several Penstemon species recommended for pollinator-friendly gardens by the Xerces Society. (I reviewed their book, Attracting Native Pollinators, last summer.) When I was photographing these flowers, I noticed that several where visited by small insects that would crawl deep inside the flowers to get at the nectar. I think this may be a sweat bee since it is not very hairy and it has a glossy bluish-green body, but a few other groups could fit that description. I any case it is probably one of the many native bee species.