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Northern Prairie Wildlife Research Center

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Macromoths of Northwest Forests and Woodlands

Brachylomia algens [Noctuidae]

JPG-Brachylomia algens

Wingspan 2.9 cm. Forewing is mottled brown to dark gray-brown with a wedge-shaped reniform spot. This noctuid is common in wet coastal forests in the Pacific West. Moths fly in mid to late summer. Caterpillars feed on the foliage of birch (Betula), poplar (Populus), rose (Rosa), and willow (Salix).

Similar species: five species of Brachylomia occur in western North America; Brachylomia rectifascia is the most common and widely distributed of these with a black longitudinal median band across the forewing, caterpillars feed on the foliage of flowering trees and shrubs; Epidemas cinerea (Noctuidae) is larger, forewing elongate and dark gray, hindwing is white in the males, widely distributed, moths fly in fall.

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