Grammia hewletti
 Grammia hewletti is a moth of the Arctiidae family. It was described by Barnes and McDunnough in 1918. It is found in south-western California.The length of the forewings is about 20 mm. The ground colour of the forewings is black with pale yellowish or pinkish buff bands. The hindwings are bright yellow but may vary to orange or scarlet. The markings are black. Adults have been recorded on wing in May.