Parinæ. Body compressed. Bill shorter than the head. Wings rounded,
equal to or shorter than the rounded tail. Second quill as short
as the tenth. Tarsus longer than the middle toe and claw, which
are about equal to the hinder; soles of toes widened into a palm.
Plumage rather soft and lax.
Sittinæ. Body depressed. Bill about equal to or longer than the head.
Wings much pointed, much longer than the nearly even tail. Tarsus
shorter than the middle toe and claw, which are about equal to the
hinder. Plumage more compact.