Here’s some D. viridifascia calls recorded by Joe Green. You can hear them, but you won’t see them in the video.
They sound like Maracas to me.
D. viridifascia calling by Joe Green from Cicada Mania on Vimeo.
D. viridifascia calling by Joe Green from Cicada Mania on Vimeo.
There’s plenty of pictures of D. viridifascia on the Bug Guide website.