This species is very similar to the November Moth and Pale November Moth and identification is usually only possible by examining the genitalia. In general this is the least variable of the three with melanic forms occurring less often. It is also usually on the wing earlier in the year, flying in September and October , although the flight seasons of all three species overlap.
Chinery, Michael Collins Guide to the Insects of Britain and Western Europe 1986 (Reprinted 1991)
Skinner, Bernard Colour Identification Guide to the Moths of the British Isles 1984
KNUSSEN: Choral. Autumnal. Whitman Settings. Secret Psalm. Prayer Bell Sketch. Violin Concerto. Requiem-Songs for Sue. Ophelia's Last Dance
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