Thanks go to John Glaser for identifying this moth. The moth shown in the Covell Field Guide is of the form which has a creamy outer (costal) half of the forewings. Both forms showed up in September. I wondered why this moth (or its larva) is called Palmerworm. That name was used in 1611, in the King James Bible, to translate the Hebrew Gazam which is found in three places in the Hebrew scriptures (Joel and Amos). The actual meaning of the ancient Hebrew word in uncertain but has been interpreted in the sense of locust, caterpillar or grub. Locusts do not have a caterpillar or grub stage, so this leaves the derivation unsolved. I suppose this is merely another case where a common name was transferred by colonists in America to a species found here that loosely resembled something recalled from the Old World. In any event, the name apparently is older than modern English.