The rarest and largest species of parrotlet is the Yellow Face weighing 50 grams and almost six inches in length. The males have deep violet blue primaries and secondaries similar to male Pacifics including the blue eye streak.
Females also have blue rumps which are lighter than the males.
As the name implies, both males and females have bright yellow faces, foreheads, cheeks, chins, chests and bellies. They also have horn-colored legs and beaks with a dark stripe running down the front of the upper beak. There are only nine verified pair of Yellow Face in the United States although they are readily bred in Europe. The Neotropical bird club has written an excellent article about the conservation of the Yellow-Faced parrotlet.