Red Helen -- Papilio helenus Linnaeus, 1758 vs Yellow Helen -- Papilio nephelus chaon Westwood, 1845
Yellow Helen -- Papilio nephelus chaon Westwood, 1845
Photo by - Gautam Ghosh ( UP )
Photo by - Priyam Chakraborty ( UN )
Idkey : UNH submarginal lunules yellow.

Red Helen -- Papilio helenus Linnaeus, 1758
Photos by Kishen Das ( UP and UN )
Idkey : UNH submarginal lunules red.

Other Helens to look for in the field :

Great Helen -- Papilio iswara White, 1842
http://en.wikipedia.org/wiki/Papilio_iswara

Pitman's Helen -- Papilio pitmani Elwes & de Nicéville, 1887
http://en.wikipedia.org/wiki/Papilio_pitmani

Noble's Helen -- Papilio noblei de Nicéville, 1889
http://en.wikipedia.org/wiki/Papilio_noblei

Andaman Helen -- Papilio prexaspes andamanicus Rothschild, 1908
http://en.wikipedia.org/wiki/Papilio_prexaspes

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