So who are these? The top row is easy: Star Boy, Superboy, and Shrinking Violet.
The boys in the bottom row are Brainy and (I presume) Sun Boy.
But who's the girl in the bottom row? She's not Phantom Girl, who was already a member at this time. There's not another dark-haired female Legionnaire until Shadow Lass (this ain't her) and then Dawnstar (also not her).
Night Girl, maybe? Laurel Kent? Life Lass? Yera in disguise? Supergirl in her secret identity? (Does Supergirl even have a secret identity any more?)
I'm baffled. Anyone?