Common NameJoined UnderwingSeasonalityAdults fly in Alberta in late August and early September.IdentificationOne of the largest (7.2- 8.5 cm wingspan) Alberta underwing moths. The forewings are a smooth evenly powdered blue-grey, with few markings. The doubled reniform spot and the lower end of the postmedian band where it crosses the fold are the most prominent markings. The hindwings are salmon or orange-pink as in parta and luciana, not red-orange as in unijuga and meskei or bright pink as in hermia and concumbens. The hindwing black median band is narrow and turns in sharply at the lower end, and in some specimens may have a small separate spot at the lower end as does C. meskei. The fringe is white and the antennae are simple, and both sexes are essentially alike.
Scientific NameCatocala juncturaCommon Name
Joined Underwing
Habitat
In Alberta, riparian cottonwood-willow groves in the valleys of the arid southern grasslands region.
Seasonality
Adults fly in Alberta in late August and early September.
Identification
One of the largest (7.2- 8.5 cm wingspan) Alberta underwing moths. The forewings are a smooth evenly powdered blue-grey, with few markings. The doubled reniform spot and the lower end of the postmedian band where it…
One of the largest (7.2- 8.5 cm wingspan) Alberta underwing moths. The forewings are a smooth evenly powdered blue-grey, with few markings. The doubled reniform spot and the lower end of the postmedian band where it crosses the fold are the most prominent markings. The hindwings are salmon or orange-pink as in parta and luciana, not red-orange as in unijuga and meskei or bright pink as in hermia and concumbens. The hindwing black median band is narrow and turns in sharply at the lower end, and in some specimens may have a small separate spot at the lower end as does C. meskei. The fringe is white and the antennae are simple, and both sexes are essentially alike.
Life History
The adults are one of the latest Alberta underwings to appear. They are nocturnal and come to light, but like other underwings are best caught using sugar baits. The eggs overwinter, and the larvae are solitary…
The adults are one of the latest Alberta underwings to appear. They are nocturnal and come to light, but like other underwings are best caught using sugar baits. The eggs overwinter, and the larvae are solitary defoliators. There is a single brood each year.
Conservation
At the northern edge of its range. No serious concern.
Diet Info
No Alberta data. Elsewhere reported to use willow (Salix).
Range
New York and Pennsylvania west to southeastern British Columbia, Montana, Colorado and Arizona, north to extreme southern Alberta and Saskatchewan. In Alberta it has been taken in the Milk River and Oldman River…
New York and Pennsylvania west to southeastern British Columbia, Montana, Colorado and Arizona, north to extreme southern Alberta and Saskatchewan. In Alberta it has been taken in the Milk River and Oldman River valleys, north to Taber.
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Citation
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Page Citation for Catocala junctura
Page Citation
"Species Details - Catocala junctura, University of Alberta E.H. Strickland Entomological Museum." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/g/2-806. Accessed 23 Nov. 2024.
References
AuthorCovell, C. V., Jr.
TitleA field guide to the moths of eastern North America.
Publication Date1984
Pages496
AuthorHandfield, L.
TitleLe guide des papillons du Quebec.
Publication Date1999
Pages536
AuthorSargent, Theodore, D
TitleLegion of night : the underwing moths
Publication Date1976
Pages222
Specimen Information
There are 8 specimens of this Species.
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8 results plotted on map in 7 markers. Note: Only records with latitude and longitude coordinates are plotted on map.