A couple of pictures from 17 September 2016 —
A mating pair of Painted Tiger Moths (Arachnis picta). Can you tell which is the female?
In this species, females are larger than males. She's on the right in the picture above, and here's a close-up of her (below). [Click on the picture for slightly larger and sharper image.]
The scales on her wings are especially visible within the gray stripes, creating a stippled pattern.
P.S. I first introduced Painted Tiger Moths in 2012 — see the post called "Painted Tiger, Hidden Dragon" on 1 October 2012; and "Now you see me..." on 18 October 2012.