Body length 15-16mm (excluding antennae and wings)
This individual appears to match the written identification information
here on BG, including how the "proximal parts of the antennae are usually (though not always) darkly colored", as apparently seen in the photo above.
View (photo #2 - next photo) LARGE on my Flickr site, to view one of the DARK SPOTS, on the side of the clypeus (
also explained here on BG).
So possibly Chrysopa nigricornis: