May beetles (genus Phyllophaga) get their common name from the typical time adults emerge (late spring) and their Latin binomial name from the eating habit of the adults: leaves. This one was a bit early (showing up in early March), but then again I am sure there is some natural variation in the phenology of the over 400 described North American species of Phyllophaga.
As true scarabs (Scarabaeidae), Phyllophaga has its antennae divided into sheet-like plates called lamellae. In the photo above, they are held together like a book, but they can be spread wide like a fan at times. I have found it hard to induce this for a photo, sadly.
As voracious herbivores both in their larval and adult stages, these guys can be major agricultural pests. In fact, I found an entire doctoral dissertation on the effects and control of one Phyllophaga species on the sweet potato crop here in Louisiana.