Catocala amatrix

Hübner, 1813

Sweetheart Underwing

Catocala amatrix, commonly known as the Sweetheart Underwing, is a large in the Erebidae. have a wingspan of 75–95 mm. The forewings are cryptically colored in gray-brown tones that provide camouflage against tree bark when the moth is at rest. When disturbed, the moth reveals strikingly colorful hindwings—typically orange-red with black bands—that serve as a startle defense against . The occurs across eastern and central North America, with adults active from August to October. Larvae feed on several species of Populus (poplars and cottonwoods) and Salix (willows).

Catocala amatrix P1250692a by
xpda. Used under a CC BY-SA 4.0 license.

Catocala amatrix 94841829 by Courtney. Used under a CC BY 4.0 license.

Catocala amatrix 24683365 by Quinten Wiegersma. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Catocala amatrix: /ˌkætəˈkeɪlə əˈmeɪtrɪks/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other Catocala by the specific pattern of the hindwing: orange-red ground color with black bands. Forewing pattern of gray-brown cryptic coloration with fine dark lines and spots. Most reliably identified by examining the hindwing color pattern and banding; similar species include other underwings with red or orange hindwings but differ in precise band arrangement and width. are larger than many related underwing species.

Images

Appearance

are large with wingspan 75–95 mm. Forewings are gray to brownish-gray with intricate dark patterning that resembles tree bark, providing effective camouflage when wings are folded at rest. Hindwings are brightly colored, typically orange-red with broad black transverse bands and a white fringe. The contrast between drab forewings and vivid hindwings is characteristic of the . Body is robust and densely scaled. are .

Habitat

Associated with riparian and woodland where trees occur. Found in deciduous forests, woodlots, and areas with mature Populus and Salix trees. are attracted to lights but often remain on the periphery of lighted areas rather than landing directly on sheets.

Distribution

Eastern and central North America. Range extends from Nova Scotia south through Connecticut to Florida, and west through Texas and Oklahoma to Arizona, north to Montana, Minnesota, and Ontario.

Seasonality

fly from August to October, with exact timing varying by location. Single brooded.

Diet

Larvae feed on leaves of Populus deltoides (eastern cottonwood), Populus grandidentata (bigtooth aspen), Populus nigra (black poplar), Populus tremuloides (quaking aspen), and Salix nigra (black willow). feeding habits are not well documented; adults of related have been observed feeding on fermenting fruit, sap flows, and other sugary substances.

Host Associations

Populus deltoides - larval
Populus grandidentata - larval
Populus nigra - larval
Populus tremuloides - larval
Salix nigra - larval

Life Cycle

Complete with , larva, pupa, and stages. Larvae are presumably solitary foliage feeders on trees. occurs in soil or leaf litter. Adults emerge in late summer and early autumn. stage is likely the egg or early larval instar, though this has not been explicitly documented for this .

Behavior

exhibit startle display : when at rest, forewings are folded over the body concealing the brightly colored hindwings. If disturbed, the rapidly opens its wings to expose the vivid hindwing pattern, which may momentarily startle and allow escape. Adults are and attracted to artificial lights, though they typically remain at the edges of light stations rather than landing on illuminated sheets.

Ecological Role

Larvae function as herbivores, consuming foliage of poplars and willows. may contribute to nutrient cycling through feeding on decaying organic matter. Both life stages serve as prey for various including birds, bats, and spiders. The is part of the diverse insect that supports higher .

Human Relevance

Subject of interest among enthusiasts and citizen scientists, particularly during National Moth Week events. The is featured in entomological collections and has been the subject of exhibition models, including historically significant specimens prepared by the Denton Brothers. No significant economic impact documented; neither a major pest nor a commercially important species.

Similar Taxa

Catocala aholibahAholibah Underwing has similar size and orange-red hindwings, but differs in hindwing band pattern and forewing maculation. C. aholibah hindwings typically show narrower black bands and different fringe coloration.
Catocala verillianaSmaller underwing with orange hindwings; C. verilliana has distinctly smaller wingspan (typically under 70 mm) and different forewing pattern with more prominent spot.
Other Catocala species with red/orange hindwingsNumerous share the general underwing and bright hindwing coloration; precise identification requires examination of hindwing band width, fringe color, and forewing pattern details.