|Common emerald moth, Hemithea aestivaria|
I love his feathery headdress. Here it is, full-size:
|The rest of the feathers are mostly green; these are turquoise.|
I think he's a male, according to BugGuide.
Females have simple antennae. Males antennae are simple in the outer 1/4, but in the hand you should see short pectinations, perhaps serrate, basally. (Comment by Bob Patterson, Bug Guide)
Pectinations are projections like the teeth of a comb.