The adult Almella Frass Moth is a silvery grey or brown moth with understated pattern of black and dark brown wavy lines on the forewings. The hindwings are plain. It rests with its wings folded on top of each other along the abdomen. The caterpillar grows to 2cm in length, and is green and becoming brown as it matures. The caterpillar shelters on the food plant in a retreat made of silk and droppings. It also pupates in its shelter.