The Reddish Buff (Acosmetia caliginosa) is a moth of the family Noctuidae.It is found throughout continental Europe and in southern Scandinavia.In Britain it is rare and has protected status, being possibly confined to a single site on the Isle of Wight. The wingspan is 23–30 mm: females are smaller than males.The moth flies in June and July. The larvae feed on saw-wort (Serratula tinctoria).