Catocala ilia-umbrosa

Ilia Underwing, Ilia Underwing Moth

Catocala ilia-umbrosa is a large underwing in the Catocala, Erebidae. Like other underwing moths, it conceals brightly patterned hindwings beneath cryptic forewings at rest. The has been documented at moth-lighting events in Colorado, including at Bear Creek Nature Center in July 2018. are attracted to ultraviolet lights.

Pronunciation

How to pronounce Catocala ilia-umbrosa: /ˌkætəˈkeɪlə ˈɪliə ʌmˈbroʊsə/

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 wing pattern details; however, precise diagnostic features for C. ilia-umbrosa versus related underwing species are not detailed in available sources. The Catocala is characterized by the underwing posture: forewings held together over the back at rest, concealing colorful hindwings. Species-level identification within Catocala requires examination of hindwing pattern, forewing markings, and often genitalia.

Appearance

Large-bodied with forewings that serve as camouflage against tree bark, concealing brightly colored hindwings. When at rest, forewings are held together over the back, hiding the hindwings beneath. Hindwings display bold coloration typical of the Catocala. Specific pattern details for C. ilia-umbrosa are not documented in available sources.

Habitat

Documented from wooded areas with trees and shrubs, including nature center settings with landscape plantings. The specific microhabitat preferences of C. ilia-umbrosa are not distinguished from those of related underwing moths in available sources.

Distribution

Documented from Colorado, USA, specifically from Bear Creek Nature Center in Colorado Springs. The full geographic range is not specified in available sources.

Seasonality

have been observed in July. Specific period details for C. ilia-umbrosa are not distinguished from other Catocala in available sources.

Behavior

. are attracted to ultraviolet lights and mercury vapor lights used in surveys. Has been observed remaining at light stations long enough for observers to view, suggesting relatively sedentary once settled.

Ecological Role

likely serve as ; larvae presumably function as herbivores, though specific plant relationships are not documented in available sources. Like other , serves as prey for including bats, birds, and predatory arthropods.

Human Relevance

Subject of citizen science observation during National Week events. Attracted to artificial lighting, making it accessible for public observation and photography. No documented economic or medical significance.

Similar Taxa

Catocala iliaClosely related with similar ('Ilia Underwing'); C. ilia-umbrosa may represent a or related form, but taxonomic relationship is not clarified in available sources.
Catocala aholibahAnother large underwing found at the same general location (Cheyenne Mountain State Park, Colorado), distinguished by specific hindwing pattern details.
Catocala verillianaSmaller underwing sympatric in Colorado, distinguished by size and wing pattern.

More Details

Taxonomic Uncertainty

The epithet 'ilia-umbrosa' suggests a possible relationship to Catocala ilia, or a distinct closely related to it. The precise taxonomic status is not clarified in available sources; some treatments may recognize this as Catocala ilia umbrosa (a subspecies) or as a full species.

Observation Context

The sole documented observation in available sources comes from a National Week event at Bear Creek Nature Center, Colorado Springs, on July 27, 2018, where the moth appeared after rain subsided and remained long enough for public viewing.