Comprehensive Description

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General Description

A medium-size (3.5-5.4 cm wingspan) long-winged moth with streaky dull grey forewings and shining white hindwings. The forewings are pale grey heavily overlain with dark grey longitudinal streaking, and lack the sharp black markings found in most dagger moths. The cross lines are absent with the exception of the rather indistinct antemedian and postmedian line, which are jagged and partially filled with white scales. The reniform is usually indicated by a slightly darker blotch, and the area between it and the orbicular is noticeably paler than the rest of the wing. There is a terminal row of black dots between the veins. The hind wings are shining white, except for the terminal row of black dots and a few darker scales along the veins. The antennae are simple and the sexes are similar. The much rarer Acronicta longa is very similar, but has several small dark markings along the lower forewing that gives it a slightly more contrasting appearance.


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© University of Alberta Museums

Source: University of Alberta Museums

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