How to Know the Butterflies

The Cornell classic that taught America to name what it saw: every eastern butterfly described from life, with its caterpillar, its food-plants, its habits — and how to pronounce its Latin.

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The Dreamy Dusky-Wing (Thanaos icelus Than'a-os)

Thanaos icelus (Than'a-os i-ce'lus) PLATE XLV, FIG. I The upper surface is blackish brown, the fore wings sprinkled with pale bluish scales; these are most abundant on the outer half of the wing; and just beyond the middle of the wing, they form a distinct hoary patch, which extends from the costal margin nearly half-way to the inner margin. There are no distinct white spots on the fore wings as in the following species. The hind wings have two irregular rows of dull yellow spots parallel with the outer margin. Expanse of wings from one and one-tenth to one and one-fourth inches. This skipper is found in nearly all parts of the United States.

The larva will feed on aspen. 3

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