|scientific name Drepana bilineata |
common name Two-lined Hooktip
Adults have been collected in Alberta from late May through mid-August.
A medium-size (2.8-3.3 cm wingspan) broad-winged moth with yellow-brown or dark tan forewings and white hindwings. The forewings are drawn out into a prominent curved hook at the apex, have a strongly toothed outer margin, and are crossed by two straight, fine dark brown lines. A small black point indicates the reniform spot. The hindwings are much paler than the forewings, are crossed by a faint median line, and have a narrow dark terminal line. The hooked forewing apex will identify this species as a hooktip, and the toothed forewing margin and pale almost unmarked hindwings will separate it from the other two hooktips, the Arched and Rose Hooktips.
The Two-lined Hooktip is nocturnal and comes to light. The long flight period may indicate at least a partial second brood. The larvae, known as the Warty Birch Caterpillar, is described and illustrated in Ives and Wong, 1988. It is reported to be a solitary defoliator (Prentice, 1963).
A fairly common, widespread species; no obvious concerns.
No specific Alberta data; in the Prairie Provinces (including Alberta) larvae are reported to feed on birch (Betula), alder (AlnusPopulus tremuloides
Newfoundland to Vancouver Island. In Alberta it has been collected throughout the Boreal forest region, north to Zama and near Ft. McMurray, south to Winfield.
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