|scientific name Digrammia irrorata |
In Alberta found in shrubby areas along river valleys of the arid grasslands region.
In Alberta collected from the latter half of May through mid June.
A medium-size (approx 2.5 cm wingspan) broad-winged brownish-grey geometrid moth. The forewings are crossed by an incomplete antemedian and complete and prominent postmedian line, buff-yellow in color and, the latter also reappearing across the lower half of the hindwings. There is a well-developed discal spot on each forewing, and a less distinct one on the hindwings. In males in particular there is usually a series of poorly defined dark spots or blotches marking the median line and crossing the forewings distad to the postmedian line. The veins on the outer half of the forewings are finely lined by pale yellow scales. The pale yellow postmedian lines across both wings lacking a border of dark scales can be used to separate irrorata from other Alberta Digrammia species (i.e. D. mellistrigata).
Poorly known. Adults are nocturnal and come to light.
Uncommon in Alberta, but a widespread species. No reason for concern.
A western species, occurring from southern Alberta west into BC, south to at least California and Arizona. In Alberta it has been collected along the eastern parts of the South Saskatchewan and Red Deer River valleys.
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