I was photographing a number of flower longhorns that were flying about and feeding. I noticed a very large bee or wasp flying erratically but it never was able to land as most of the flower stems would not support its weight. Finally, it landed on a more robust stem and it turned out to be a large wasp, struggling with a flower longhorn. I watched for at least ten minutes, it was not over when I left. Looks as though the wasp was trying to sting through the elytra not too successfully. Any chance of ID for either?