The following table divides all North American Catocala species into twenty one different groups. Moths are grouped according to hindwing colour bands (yellow, orange, salmon, red, pink, black or white) and wingspan measurements (small = 35-55mm, medium = 55-75 mm and large = 75mm plus).
Wingspan refers to the distance from wing tip to wing tip when the moths are spread with the inner margin of the forewing perpendicular to the body.
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