Adela flammeusella is a moth of the family Adelidae or fairy longhorn moths. It was described by Chambers in 1876. It is found from southern Washington south to the foothills and interior valleys of most of cismontane California. The length of the forewings is 5–6 mm. Adults are dark coppery bronze, usually with three to five cream-colored spots in males. Both sexes have metallic purple hindwings. Adults are on wing from late March to early June. The larvae probably feed on various species of Orthocarpus and/or Castilleja.