Self-portrait with almost-identified moth

[urbpan]

This moth by my porch light is one of two species: either a winter moth, Operophtera brumata, or a Bruce spanworm O. bruceata. Bruce spanworm moths are more likely to be flying in autumn, but there's a chance that this is a winter moth flying early. The field marking that distinguishes them is a small spot on the underside of their hind wings.

This is a male moth, by the way, females of both above species are flightless.