The female thinly scaled, milky white, with the abdomen of the same colour; wings very sparsely dotted, ab.

If the female of standfussi is recrossed with the male of rustica a white and much dotted moth results, the form inversa Car..

But we have true hybridisation if the male of rustica is crossed with another species of the genus, e.g., with Diaphora sordida Hbn.

[1] The female resembles Spilosoma lubricipeda, but that species has longer and smaller wings and a yellow and black back.

Larva grey-brown, greenish laterally, with reddish brown warts and foxy red hairs; on the back a median line, which is sometimes indistinct.