Morning-glory Prominent Moth Caterpillar

I'm seeing a few of these on an apple tree in my yard. I'm not spraying just yet. They don't seem to be doing widespread damage. I'm going to take a wait-and-see approach.

Notodontidae, Heterocampinae, Schizura sp. and looks like being Schizura ipomoeae. Note also the "cross" on the back in this link and yours: http://bugguide.net/node/view/338415/bgimage http://bugguide.net/node/view/600647/bgimage http://bugguide.net/node/view/28016/bgpage