And today I found a promethea moth in the same area (obviously drawn by our patio light, which we've been leaving on since a rash of scary nighttime break-ins a few months ago). Another of the Saturniid royal silkmoths. This one is about 4-4.5inches across, and based on internet info, seems to be a male. I'm going to turn off the patio light tonight, since i read that hanging about the light can keep the moth from finding a female and reproducing.
Both snapshots were taken by my cellphone camera -