|scientific name Euxoa septentrionalis |
The only Alberta specimen was collected September 8.
A medium-size (4.0 cm wingspan) dull brownish grey moth with darker grey-black markings. The forewing is crossed by doubled AM line and PM lines. The round orbicular and kidney-shaped reniform spots are lighter grey, with the area before, between and just distad of the spots filled with black. The hindwings are light grey-brown, darker toward the outer margin. Euxoa septentrionalis is most similar to E. messoria. It can usually be separated from messoria by the darker markings and by the round, not oval, orbicular spot. Questionable specimens can be readily separated by genitalic characters. Males have the right saccular extension flattened and "shovel-shaped"; in messoria it is tapered apically. Lafontaine (1987) illustrates both adults and the genitalia of both sexes.
Poorly known. There is a single annual brood, and adults are nocturnal and come to light. The larvae and other immature stages are unknown.
Rare in Alberta, at the extreme eastern edge of its range.
There are no host data for septentrionalis, but like most Euxoa they are likely generalists on low growing herbs.
Western North America west of the Continental Divide, from southern BC and extreme southwestern Alberta south to California and southwestern Arizona. In Alberta it has been collected only in the Crowsnest Pass near Hillcrest. Specimens in the UASM collection labeled Lethbridge were disected and found to be misidentified.
Euxoa septentrionalis is one of only three species in the subgenus Heteroeuxoa. This dull grey-brown moth has been collected in Alberta only once, a single female collected by Bowman many years ago in the Crowsnest Pass at Hillcrest. Bowman also reported specimens from Lethbridge, but the two specimens in his collection from Lethbridge have been dissected and proved to be misidentified E. messoria.
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