DescriptionMostly brown. Named “corporal” because immatures have a pair of pale stripes on the top of the thorax; they also have a dark stripe on top of the abdomen. Mature adults are “chalk-fronted” with distinctive pale pruinescence on the front of the thorax, as well as the base of abdomen – white on males, grey on females. The wings are clear except for small, dark marks at the bases, those on the hindwings are triangular. Length: ♂ 42 mm, ♀ 40 mm.
Flight PeriodB.C., late May to early September (generally most common early in the summer).