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General DescriptionA medium-size (3.2-3.6 cm wingspan) brownish-grey moth. Male antennae are strongly biserrate and bifasculate; female simple. Head and thorax even grey-brown without contrasting prothoracic collar. The basal, antemedian and postmedian lines on the forewings usually well marked and doubled, the later narrowly toothed at the veins. The orbicular and reniform spots are well defined, with the orbicular a large oval. A median line or shade is often present. The terminal area is narrowly darker than the remainder of the wing. Fringe concolorous with wing. Hindwing white in male, shading to light smoky-brown on the margin, more extensively dark shaded in females. There is a small discal dot, the veins are narrowly lined with brown scales, and the fringe is mostly white. Form "atrifera" lacks the cross-lines on the forewings and has a broad black basal dash and a black streak before and between the orbicular and reniform, and the costa is often contrasting paler than the remainder of the wing. Messoria belongs to the subgenus Longivesica, characterized by the extremely long vesica in the male and by the very long appendix bursae, twice the length of the corpus bursae, in females. Lafontaine (1987) provides keys to the subgenera and species of Euxoa>, and illustrates the genitalia of both sexes.