This caddisfly was perched on a leaf in the shade of a tree, not far from Mizumachi Lake near Nogata. I couldn’t identify it at first because I was stupidly looking in my moth books. Then I realized that it wasn’t a moth… (red face!)
Wikipedia article about Trichoptera: here.
“Black dancer” caddisfly = ao-higenaga-tobikera
Location: Park near Nogata (Google map)