The writer is not aware that observations on the exceedingly interesting oviposition habits of Phlepsius decorus O. & B. have ever been published. A single female of this species was captured on a sunflower plant at Webster Groves, Mo., June 30, 1933. It was placed in a celluloid, cylinder cage enclosing the terminal bud and young leaves of a half-grown sunflower plant where it began feeding at once.