Key to the Subfamilies of the Nymphalidæ of Temperate North America

I.	With the veins of the fore wings not greatly swollen at the base.
	A.	Antennæ naked, not clothed with scales.
		(a) Fore wings less than twice as long as broad		Euplœinæ.
		(b) Fore wings twice as long as broad and often translucent, the abdomen extending far beyond the inner angle of the hind wings		Ithomiinæ.
	B.	Antennæ clothed with scales, at least above.
		(a) Fore wings at least twice as long as broad		Heliconiinæ.
		(b) Fore wings less than twice as long as broad.
			1. Palpi not as long as the thorax	Nymphalinæ.
			2. Palpi longer than the thorax	Libytheinæ.
II.	With some of the veins of the fore wing greatly swollen at the base			Satyrinæ.