This year seems to have produced a bumper crop of yellow jackets (meat bees) all over California. Sounds like that extends East.
Haven't had a problem with them riding, but did get stung by a bee in the calf while descending hwy 39 at about 40mph 2 weeks ago. When I stopped about 10 miles down the stinger and sac was still attached. in hindsight I should have stopped sooner and scraped it off.
A couple of years ago I hit an entire swarm that was in the shadow of a tree on a descent, but since they are not aggressive when swarming, didn't get stung, but the multiple splats were disconcerting. If the jersey had been unzipped that could have been a bad scene.