The Red-green Carpet has a cycle where the larvae feed on leaves of trees during the year and then pupate to emerge around now. The adults mate and the female goes on to overwinter, but the males die off. When the new leaves arrive in springtime, the female will come out of hibernation to lay her eggs and next year's single generation will be under way. So in this case we have the unusual 'seasons' where both adults are found from September to November, but with the female also being seen in March to May.
Given the very short breeding season, I suppose it's not all that surprising that this species will fly when others refuse to endure the rain or cold, and yesterday I found this specimen on a door-frame just as we arrived back from walking the dogs:
|Red-green Carpet - Chloroclysta siterata|