Catocala subnata

Grote, 1864

Youthful Underwing

Catocala subnata, commonly known as the youthful underwing, is a large underwing in the Erebidae. First described by Augustus Radcliffe Grote in 1864, this is characterized by its cryptic forewings that conceal brightly colored hindwings, a defensive trait shared with other members of the Catocala. The species has a broad distribution across eastern and central North America, with active during mid to late summer. Larvae feed on specific trees in the walnut family.

Catocala subnata 49897766 by Susan Blayney. Used under a CC BY 4.0 license.

Catocala subnata YPM ENT 854751 D by Lazarova, Y. P.. Used under a CC0 license.

Catocala neogama P1460960a by
xpda. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Catocala subnata: /ˌkætəˈkeɪlə ˈsʌbnəˌteɪ/

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 specific forewing pattern elements and hindwing coloration. The "youthful underwing" refers to particular markings. Accurate identification to species level typically requires examination of wing pattern details and, in some cases, genitalia dissection. Similar species include other eastern North American underwings such as Catocala ilia and Catocala concumbens, which differ in forewing maculation and hindwing banding patterns.

Images

Appearance

Wingspan 75–90 mm. Forewings are cryptically colored in shades of gray and brown, providing camouflage against tree bark when at rest. Hindwings are concealed at rest but display bold coloration when exposed—typically featuring bands of orange, red, or yellow with dark markings. The body is robust and densely scaled. are feathery in males, less so in females.

Habitat

Deciduous and mixed forests, particularly areas with mature stands of trees. Found in riparian woodlands, upland forests, and suburban areas where walnut and hickory trees are present. Elevation range extends from coastal plains to moderate elevations in the Appalachian Mountains.

Distribution

Eastern and central North America: from Manitoba, Ontario, Quebec, and New Brunswick east to Nova Scotia; south through New England to North Carolina; west through Tennessee, Kentucky, and Texas; north through Iowa, Wisconsin, and Michigan.

Seasonality

are active from July to September, with peak varying by latitude and local climate. Single per year ().

Diet

Larvae feed on Carya cordiformis (bitternut hickory), Juglans cinerea (butternut), and Juglans nigra (black walnut). feeding habits are not well documented; adults of related Catocala have been observed feeding on tree sap, rotting fruit, and other fermenting substances.

Host Associations

Carya cordiformis - larval plantBitternut hickory
Juglans cinerea - larval plantButternut
Juglans nigra - larval plantBlack walnut

Life Cycle

Complete with four stages: , larva, pupa, and . Eggs are laid on or near trees. Larvae feed on foliage of host plants, developing through multiple instars. occurs in soil or leaf litter. Adults emerge in summer, with one produced annually. stage is the pupa.

Behavior

are and generally do not come readily to artificial lights, or remain on the periphery of lighted areas when they do. When disturbed, adults flash their brightly colored hindwings to startle before taking . Adults are strong fliers and may be flushed from daytime resting positions on tree trunks.

Ecological Role

Larvae function as herbivores, consuming foliage of trees and contributing to nutrient cycling. serve as prey for including bats, birds, and spiders. The Catocala is an important food source for and predators in forest .

Human Relevance

Subject of interest to lepidopterists and citizen scientists, particularly during National Week events. Not considered an agricultural pest. tree associations make it an for mature deciduous forests containing walnut and hickory. No significant economic impact documented.

Similar Taxa

Catocala iliaSimilar eastern North American underwing with overlapping range; differs in forewing pattern and hindwing coloration details
Catocala concumbensAnother underwing with cryptic forewings and bright hindwings; distinguished by specific banding patterns on hindwings
Catocala aholibahLarger underwing with which it may co-occur; differs in size and specific wing markings

More Details

Conservation Status

Not formally assessed by IUCN. trends unknown, but likely stable where trees remain abundant. Vulnerable to loss and decline of Juglans cinerea due to butternut canker .

Research History

Original description by Grote in 1864 based on specimens from the northeastern United States. Relatively well-documented within a that presents significant identification challenges due to high and morphological similarity.