How totally COOL Russ! My "Butterflies of the North Woods" book says that they do have two broods per year...second flight period is Aug-Sept. BTW, what did you do with the original "Cat"? Summer Pupae take about a month... but this one may have been hiding in your house prior to the original.
Second brood will overwinter as a chrysalis, often on the side or ledge of your house!
BEAUTIFUL pics too!