I found that
Acanthopsyche atra feeds on certain grasses including Gramineae which includes bamboo. I have one just outside the greenhouse in a large pot, but I also have other grassy plants such as Dierrama.
Acanthopsyche
Some pics I found which look very similar,
Bestimmungshilfe des Lepiforums: Acanthopsyche Atra
It's not listed on the NBN Gateway, but not everything is.