Lithomoia germana

The brindled forewing pattern with irregular dark transverse lines and a mix of brown, gray, and black tones distinguishes this species from many similar noctuids. The combination of early spring flight period (April-May) and late summer/autumn second generation (August-October) helps separate it from univoltine relatives. The overall appearance resembles bark, making it difficult to spot at rest. Examination of genitalia may be required for definitive identification from closely related Xylena and Lithomoia species.

Adults have a wingspan of approximately 40 mm. The forewings display a complex brindled pattern of brown, gray, and black markings that provide cryptic camouflage against bark. The hindwings are typically paler, often dull grayish or brownish with subtle venation visible. The body is robust and densely scaled, with a furry thorax. Overall coloration is highly variable but consistently features intricate mottling that blends with tree bark textures.

Associated with forested and wooded habitats, particularly where host plants in Salicaceae (willows, poplars) and Betulaceae (birches, alders) occur. Found in boreal and temperate deciduous and mixed woodlands, as well as riparian corridors with dense shrub growth. Adults are often found resting on tree trunks during daylight hours.

Transcontinental in northern North America. Range extends from Alaska across Canada to Newfoundland, southward through the northern United States to Pennsylvania in the east, Colorado in the central region, and Oregon in the west. The subspecies Lithomoia germana morrisoni occurs in Alaska, and L. g. albertae in Alberta.

Bivoltine with two distinct flight periods. First generation adults active from mid-April to early May; second generation from mid-August to early October. The extended period between generations reflects adult hibernation through summer.

Larvae feed on leaves of various trees and woody shrubs, specifically documented from families Salicaceae and Betulaceae. Adults feed on nectar, with goldenrod (Solidago) flowers specifically recorded as a nectar source.

• Salicaceae - larval food plant familyincludes willows and poplars
• Betulaceae - larval food plant familyincludes birches and alders
• Solidago - adult nectar sourcegoldenrod flowers

Complete metamorphosis with egg, larva, pupa, and adult stages. The species exhibits adult hibernation (hibernacula), with mature adults overwintering to emerge in spring. This results in a bivoltine pattern where the spring generation reproduces, larvae develop through summer, and a second adult generation emerges in late summer. These late-season adults then hibernate to complete the cycle.

Adults are nocturnal and attracted to light. They hibernate as adults, seeking sheltered locations such as under bark, in leaf litter, or in other protected microsites during winter months. Daytime resting posture involves pressing flat against tree bark to exploit cryptic coloration. Adults have been observed feeding on goldenrod nectar during their active periods.

Larvae function as folivores on woody shrubs and trees, contributing to nutrient cycling and serving as prey for parasitoids and predators. Adults serve as pollinators when visiting flowers for nectar. The species represents part of the diverse noctuid fauna supporting higher trophic levels in boreal and temperate forest ecosystems.

Occasional specimen in entomological collections. Not an agricultural or forestry pest. Adults may be encountered at porch lights in rural and suburban areas within their range. Of interest to lepidopterists studying overwintering strategies and seasonal phenology patterns.

• Xylena speciesClosely related and formerly classified within Xylena; share similar size, wing shape, and cryptic bark-matching coloration. May require genital dissection or detailed wing pattern analysis for separation.
• Other Lithomoia speciesCongeneric species share overall morphology and life history traits; geographic range and subtle wing pattern differences are primary distinguishing features.
• Other Noctuinae with brindled forewingsMany noctuids exhibit similar bark-matching coloration; flight timing (especially the early spring generation) and specific pattern elements help distinguish L. germana.

• bivoltine
• adult hibernation
• boreal
• nocturnal
• cryptic coloration
• forest moth

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life