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In Eastern Peru and Bolivia—

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Heliconius aristona. Melinæa cydippe. (?) Mechanitis mothone.

In Pernambuco—

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Heliconius ethra. Mechanitis nesæa.

In Rio Janeiro—

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Helieonius eucrate. Mechanitis lysimnia.

In South Brazil—

$\lbrace$	Thyridia megisto. Ituna ilione.
$\lbrace$	Acræa thalia. Eueides pavana.

Besides these, a number of species of Ithomia and Napeogenes, and of Napeogenes and Mechanitis, resemble each other with equal accuracy, so that they are liable to be mistaken for each other when on the wing; and no doubt many other equally remarkable cases are yet unnoticed.

FIG. 25.—Wings of Ituna Ilione, female. Wings of Thyridia megisto, female.

The figures above of the fore and hind wings of two of these mimicking species, from Dr. Fritz Müller's original paper in Kosmos, will serve to show the considerable amount of