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Species Page - Euxoa olivia
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scientific name    Euxoa olivia    

habitat
Arid grasslands and croplands.

seasonality
Adults have been collected in Alberta in August.

identification
Olivia is another medium-size (approx. 3.5 cm. wingspan) grey-brown western aridland Euxoa, variable in appearance and difficult to characterize except by genitalic characters. In the male, the forewing ground is yellow-brown to orange-brown and the hindwing is white shading to brown along the margin. Females are grey or silver grey on the forewing with a pale grey hindwing with darker veins. Olivia belongs to the Euxoa subgenus Heteroeuxoa; males can be identified by the asymmetrical saccular extensions and the shape of the vesica, and females by the shape of the bursa from which the ductus seminalis arises. Although the female of olivia has a corpus bursa similar to that of the E. ochrogaster species group, the ductus seminalis arises ventrolateral to the ductus bursae instead of dorsal or dorsolateral. In the male genitalia the harpe is c-shaped, markedly curved in the apical half, and the sub-basal diverticulum is lacking and replaced by a spiny pouch of vesica. Lafontaine (1987) provides illustrations of the adults and genitalia of olivia, as well as keys to the subgenera and species of Euxoa.

life history
There is a single brood annually, and both the adults and larvae are nocturnal.

conservation
An uncommon but widespread species; no concerns.

diet info
Strawberries (Fragaria) and corn (Zea) (Lafontaine, 1987). Probably many other low plants.

range
From southern Manitoba west to southern BC, south to Texas, New Mexico and California. In Alberta it has been collected in the arid grasslands, north to Lethbridge.

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=4271



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References (1)
Specimen Info
There are 37 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (37)
Related Links
Moth Photographers Group

 

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