Found inside flower of Abutilon palmeris which has a fairly limited range in the desert southwest. When first photographed, I had jotted down Pyralid in my notes.
However, considering where it was found and the resemblance to Schinia species, that is where I focused my initial search. There do not seem to be any matches in Schinia with a pale ST area and yellow/black hindwing pattern showing on this moth. Then, just before submitting for ID, I noticed that the dark patch in the AM area does not curve back up at the inner margin as is generally the case with Schinia. So, I went back and searched Pyralidae without having any success.