螟蛾科成虫大多为小型或中型蛾子,体细弱,鳞片细密而紧贴,颜色不鲜。触角线状,细长,下唇须一般较发达,向前伸,或向上弯,或向下弯。足细长;腹部有鼓膜器;前翅较窄长,一般有翅脉12条,第一臀脉消失,无副室;后翅一般有翅脉8条,因有臀区而较宽大,Sc+R1与Rs很接近,或在中室前平行,或中间有一部分结合,从中室下角及下缘分出4根脉(M2、M3、Cu1、Cu2),有三根臀脉。成虫具有趋光性、通常夜间活动。 Pyralidae adults are mostly small or medium-sized moths, body weak, fine and close to the scales, the color is not fresh. Antenna linear, slender, lower lip generally more developed, forward stretch, or upward bend, or bend down. Foot slender; abdomen tympanic membrane; forewing more narrow and long, usually 12 veins, the first rut disappears, no deputy chamber; hind wings are generally 8 veins, because of the buttocks and wider, Sc + R1 and Rs are very close, or parallel to the middle of the room, or the middle part of the combination of the middle and lower edge of the chamber points out four veins (M2, M3, Cu1, Cu2), there are three rumps. Adults have phototaxis, usually at night activities.