I believe this butterfly is some kind of Fritillary, but I'm not sure and don't have my reference handy.
Update on the hornets!!! In a big-time downpour their nest got knocked down. Tore it off the branch and tore its opening even farther than it had been. The morning after I could still see a black insect or two, but yesterday I checked the remains which are laying on a lower branch, and it's totally abandoned. Mother Nature solved the problem of being too close to the carport for us!