|scientific name Clostera brucei |
common name Bruce's Chocolate-tip
Mature deciduous and mixedwood forest.
Adults are on the wing from May through early July.
A small (2.5-3.0 cm wingspan) dark grey-brown moth, darker and less contrastingly marked than the other Clostera species. It is most easily confused with small, dark specimens of C. apicalis. C. apicalis hase rusty-red or dark orange along the upper section of the postmedian line on the forewing; this is greatly reduced or absent in brucei. Clostera strigosa is larger with pale yellow mottling in the apical area, and C. albosigma has the dark terminal part of the forewing sharply divided from the remainder of the wing. Male antennae bipectinate; sexes similar.
The adults are nocturnal and come to light. The larvae are reported to be both solitary and gregarious leaf-folding defoliators. There is a single brood each year.
Uncommon to locally common and widespread; no concerns.
No specific Alberta data; elsewhere in Canada (including Alberta) Trembling aspen (Populus tremuloides), willow (Salix sp.) and Balsam poplar (Populus balsamifera).
Across southern Canada, from Quebec to coastal British Columbia, north to Yukon and south to New Jersey and California. In Alberta found mainly in the southern Boreal forest and foothills areas, but also present in the aspen parklands.
Comments are published according to our submission guidelines. The EH Strickland Entomological Museum does not necessarily endorse the views expressed.