At first I thought it was the Cinnabar moth but it looks more like a beetle.

Looks like one of the firefly species. Photinus or one closely related to it.

Eileen is spot on as usual.

each different species has its own flight pattern/height and flash sequence. this usually ensures the right species mate.
Part of the A-level syllabus used them as an example of sexual behavioural and evolutional trends.

There must be many happy fire flies in my yard because it flashes like the Las Vegas strip. I understand different species have different colors too. These have a green/yellow flash. The chemical synthesis needed to produce such a light is quite amazing!