Langmaid's and Lesser Broad-bordered Yellow Underwings

Using the criteria published about the hindwing and the "fingers" on the underside of the forewing of this pair it is necessary to handle the moths and open the wings. There are some obvious differences without such intrusive handling. I'm not putting forward an opinion as to whether Janthina is a valid species, but just some morphological differences between to two "types" I catch.

Langmaid's Yellow Underwing, Noctua janthina, (right) compared to Lesser Broad-bordered Yellow Underwing, Noctua janthe. It is short and stubbier and duller. This is typical of all of those I've caught.

Looking through a perspex pot the underwing of the Langmaid's Yellow Underwing is dark and dull, especially the outside corners.

The Lesser Broad-bordered Yellow Underwing is much brighter and clearer. I did confirm that both of these also conformed to the other morphological differences.