|scientific name Euxoa simona |
Primarily montane grasslands, but also on the arid "high plains" grasslands.
Adults have been collected in Alberta from late June through July.
A medium-size moth (4.0-4.4 cm wingspan). Forewings grey-brown, somewhat mottled with coppery brown or paler grey patches. Basal and antemedian lines poorly defined, often doubled, postmedian line usually not doubled, obscure and shortly toothed at the veins. Orbicular spot large, circular, and it and the reniform spot each have a dark outer ring, pale inner ring and a dark center. The short claviform is usually discernable. Terminal area slightly darker than rest of wing; fringe concolorous. Hindwings pale grey or dirty white suffused with smoky brown, heaviest toward the margin, and with a small discal spot and white fringes with a brown basal line. Female hindwings with more dark suffusion than male. Very similar to E. pleuritica, but larger, darker brown on all wings, and males with shorter saccular extensions. Also very similar to E. pestula, which is smaller, darker and usually has clearer markings.
Euxoa simona belongs to the subgenus Pleonectopoda, characterized by the prominent twist or subbasal coil in the vesica of the male. There are no characters that can be used to identify females as members of the subgenus. Keys to the subgenus and species are presented in Lafontaine, 1987.
There is a single annual brood, and the adults come to lights. The immature stages are unknown.
Uncommon in Alberta which is at the northern and eastern edge of its range.
No data. Related species of Euxoa, where known, are general feeders on a variety of low broad-leaved plants.
Southern Alberta and British Columbia south to Colorado and northern California. In Alberta it has been collected in the southern parts of the shortgrass prairie region, northwest to the foothills near Calgary.
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