Simyra albovenosa, the reed dagger, is a moth of the family Noctuidae. It is found in most of Europe, then Turkey, Iran, Transcaucasus and into the east Palearctic (Central Asia, Siberia). The wingspan is 32–40 mm. Forewings whitish-ochreous, sometimes sprinkled with dark fuscous; indistinct brownish median, submedian, and dorsal streaks; sometimes blackish terminal dots. Hindwings white. Larva blackish or dark brown-grey, pale-marbled; subdorsal and subspiracular lines pale ochreous-yellowish, often reddish-marked; tubercles on these yellow or orange; fascicles of pale reddish-brown and black hairs; head black, streaked with ochreous.