Synonyms and other taxonomic changes
described in 1773 by Drury, who originally placed it in genus Phalaena
Adult: similar to G. parthenice, G. phyllira has a less robust body, deeper pink shade of the hindwing, and the antemedial forewing band is vertical (perpendicular to the inner margin), not perpendicular to the costa as in parthenice. (U. of Alberta)
Fields, etc. with host plants
Larvae feed on corn, lupine, tobacco, and other herbs.
Adults probably do not feed.
G. oithona was once considered a separate species, but is now being treated as a western population of Grammia phyllira, sometimes listed as Grammia phyllira 'oithona'.
Similar to G. placentia.
Also sometimes confused with G. parthenice. The distinctions are as follows:
On the FW of G. parthenice the transverse line (pale bar) at the end of the discal cell is bent toward costa, whereas phyllira has a straight transverse line leaning more toward the apex. The AM band of the FW of phyllira is perpendicular to the inner margin, whereas in parthenice it is perpendicular to the costa.
Also, phyllira has deeper pinkish red hindwings than parthenice, whose hindwings are a lighter salmon color. The thin lines (which are veins with light colored scaling) can be present or absent in phyllira. G. parthenice also has a fairly thick pale fringe (concolorous with transverse lines) on the outer margin of FW, whereas phyllira does not.
Lastly, parthenice has a strong pale border (concolorous with transverse lines) along the entire FW inner margin (even merging with terminal fringe), whereas in phyllira this border tapers off just past half way from the base, before reaching the FW tornus.
Covell, p. 71, plate 15 #1 (1)