Difficult to say as there's thousands of beetles, many of which look very much like each other.
Best guess is Tenebrionidae due to the long femora and general shape but I can't see enough to say much about it and if I could I doubt I would be able to say what it is for sure.
http://tolweb.org/Tenebrionida...
http://knowledgebase.lookseek....
http://bugguide.net/node/view/...
It's a lone beetle, it might be nibbling the flower or drinking nectar, whatever the flower will die off soon and the beetle won't be around for long. It could easily be food for birds.
