Epirrhoe alternata

Distinguished from similar carpet moths (Epirrhoe and related genera) by the combination of: (1) prominent white or pale band on forewings, (2) toothed wing margins, and (3) relatively broad dark band distal to the pale band. Epirrhoe rivata typically shows more uniform gray coloration with less contrasting banding. Xanthorhoe species often have more orange or reddish tones and different band arrangement. Examination of genitalia may be required for definitive identification of worn specimens.

Wings display alternating light and dark transverse bands, typically with a prominent white or pale band crossing the forewings. Wing margins are toothed or scalloped. Forewing length approximately 12-16 mm. Body relatively slender with muted gray-brown ground coloration. Pattern provides cryptic camouflage against lichen-covered bark.

Found in diverse environments including deciduous and mixed woodlands, hedgerows, scrubland, gardens, and parklands. Associated with areas supporting the larval host plants. Occurs from lowlands to moderate elevations. In North America, particularly common in northern forested regions.

Palearctic region throughout Europe and northern Asia (excluding China). Near East. North America: across the northern tier of the United States and all Canadian provinces and territories. Absent from southern United States and most of Mexico.

Adults active primarily April through July in temperate regions, with peak activity in May and June. Single-brooded (univoltine) in northern parts of range; possible partial second generation in southern areas with favorable conditions.

Larvae feed on bedstraws (Galium species, Rubiaceae). Specific feeding records include cleavers (G. aparine) and other Galium species.

• Galium - larval food plantprimary host genus

Egg stage duration unknown. Larvae present summer through autumn, overwintering as pupae in soil or leaf litter. Adults emerge in spring. Complete development from egg to adult spans approximately one year in temperate climates.

Adults are nocturnal and attracted to light. Rest with wings held flat or slightly tented over body. Flight period relatively brief, concentrated in spring months. Larvae are ground-dwelling or low-herb feeders, active at night.

Larval herbivore on native and introduced Galium species. Serves as prey for various insectivores including birds, bats, and predatory arthropods. Adult moths contribute to nocturnal pollination to a limited degree.

Occasionally encountered in gardens where bedstraws grow; not considered a pest. Of interest to moth enthusiasts and naturalists due to its distinctive appearance and wide distribution. Frequently photographed and documented by citizen scientists.

• Epirrhoe rivataSimilar size and wing shape, but typically lacks the prominent contrasting pale band; more uniform gray coloration
• Xanthorhoe montanataOverlapping habitat and similar carpet moth appearance, but shows orange or reddish central band rather than white
• Xanthorhoe fluctuataComparable wing pattern geometry, but ground coloration includes more brown and orange tones; banding pattern differs in relative width and position

• geometridae
• larentiinae
• carpet moth
• palearctic
• nearctic
• spring moth
• bedstraw feeder

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Itty bitty tiny little flies | Beetles In The Bush