On one of them a golden
|Golden back, black pronotum and head.|
|Pidonia scripta, a flower longhorn|
This looks similar to the soldier beetle I usually see, the Common Red Soldier Beetle, Rhagonycha fulva, often in large groups, usually mating. It has the long golden body, but with black tips on the tail, and a red head. I only saw the one beetle here, although I looked at other flowers nearby.
|Common Red Soldier Beetle, Rhagonycha fulva, on daisy, June 2010|
When we came back to the shore an hour and a half later, this same beetle, as far as I could tell, was still on the same flower. And still alone.
UPDATE: BugGuide has identified it as Pidonia scripta, a flower longhorn beetle. Post corrected accordingly.