Photographed at night as it was nectaring on crucita ("Eupatorium" odoratum). Two individuals were present. Very similar to Palpita quadristigmalis, but in that smaller species, the wings are even more translucent and there are four small dark dots immediately along the lower edge of the brown forewing leading stripe on each wing.

FW length ~15mm.

Update (11/5/14): Adding a second image of the same moth taken about 30 sec. later on the same flower. ***Note the small dark discal dots on the FW, not visible in the first image. I don't know what this does for the identification!