The Yellow-line Quaker (Agrochola macilenta) is a moth of the family Noctuidae. It is found in Europe except Russia and Asia Minor. The wingspan is 32–36 mm.Forewing ochreous washed with pale fulvous; the inner and outer lines very faint, marked chiefly by the dark teeth on the veins; a dark spot at base of wing; median shade variable; stigmata of the ground colour, with slight pale outlines, the lower end of the reniform nearly always black; submarginal line ochreous edged inwardly with rufous, nearly straight except for the angulation on vein 7; hindwing grey, the fringe rufous; — in the ab. nigrodentata Fuchs the basal, inner, and outer lines are all strongly marked, blackish and dentate.