I sent Bob Patterson an email about this one. He didn't comment on the ID but simply said he would delete the MPG datapoint for lixaria from Crawford County, PA. I moved it to genus for now.

I live in Middlesex Co., NJ. If this moth showed up in my yard, I'd have no trouble calling it lixaria. I find both lixaria and bistriaria locally. Having said that, the only "spring form" Emeralds I've found have been bistriaria, but what I'm calling lixaria (based on the ID characters given online and in the most recent Peterson moth guide) seems to be much more common later in the season. This does worry me. On the other hand, maybe lixaria is a summer immigrant to my area (which is not on the coastal plain but is nearby)? Who knows.

In Smith's 1909 list of NJ insects, he claims a specimen of lixaria from Lake Hopatcong, which is well inland from the "Atlantic coastal plain from NJ southward" of range statements in Covell's field guide and Wagner's Caterpillars of Eastern North America. I'd love to see that specimen, if it still exists.

Although Crawford County, PA, is not much further north, it is on the other side of the Appalachian Mountains so it may be out of range. Just though I'd mention that. Also, I noticed that lixaria seems to have a sharper bend in the am and pm lines in the hind wing but that is just my observation and may be worthless.