The question of the proper allocation of the subgeneric names introduced by Walker (Insect. Saund. Dipt, i, 1850) for the division of the genus Pangonia, Latr., appears never to have been entirely or satisfactorily settled.

In his work Walker subdivided Pangonia into 15 subgenera, for which he proposed the names Nuceria, Fidena, Dicrania, Melpia, Scaptia, Pangonia, Tacina, Phara, Clanis, Osca, Philoliche, Scione, Plinthina, Scarphia and Lilaea. Three of these names (Dicrania, Pangonia, and Philoliche) were, however, adopted from previous authors. Three of the names (Dicrania, Pangonia, and Scione) have been utilized since that date, though in the case of Dicrania the name of the genus has recently been altered to Elaphella, while Walker used the name Pangonia for a group of the genus (sens, lat.) in which the type species was not included.