This is just one more example of how everything is connected to everything else somehow.
Red-eared Blister Beetles wrestling with the Iron Cross Beetles. It was tough to tell if they were trying to mate with them, or having some kind of aggressive issue with their cousins. Red-ears have their own swarms earlier in the spring when brittle bush is in full bloom, so these few seemed to have missed the high season for mating with their own. I suspect that this perennial urge is what got this one to pursue and mount a beetle of a different species, but probably with no success, since beetle mating paraphernalia, as with most insects, is highly specialized.