Lunar underwing  The lunar underwing ("Omphaloscelis lunosa") is a moth of the family Noctuidae. The species was first described by Adrian Hardy Haworth in 1809. It has a scattered distribution in western Europe including Spain, Scandinavia and Algeria. This is a variable species, the forewings ranging from pale buff to dark brown although the paler forms are generally more common. The forewings are usually marked with two dark stigmata and a black streak near the apex. The hindwings are whitish marked with a dark moon-shaped crescent on the hindwing is partially diagnostic and which gives the moth its English name. The wingspan is 32–38 mm. Forewing varying from pale greyish ochreous to rufous and dark purple brown, the veins generally pale; upper stigmata distinct and filled up with dark, with distinct pale outlines; inner and outer lines double with paler centres, the inner obliquely curved out, the outer simply sinuous; submarginal line pale, preceded by a row of dark spots, and on costa by a black blotch or bar; hindwing whitish, suffused with grey, especially in the female, with large grey cell spot and interrupted submarginal band. The type form is dull red without pale veins; the red forms with pale veins are ab. "rufa" Tutt;the palest form of all is "obsoleta" Tutt without pale nervures; a somewhat darker, more brownish form, with the veins pale is "humilis" H. & Wwd.; "brunnea" Tutt has the ground colour deep red-brown with pale veins; in "subjecta" Dup. it is dark grey brown, the extreme development of which, "agrotoides" Guen., is blackish grey; — "olivacea" Vasq., from Spain, has the forewing pale olive ochreous, and "rubra" Vasq., also from Spain, has it pale reddish ochreous. . This moth flies at night from August to October and is attracted to light and flowers. The larva feeds on all parts of various grasses, overwintering in this form.