|scientific name Pero morrisonaria |
common name Morrison's Pero
Widespread in most forested habitats, particularly the southern boreal and aspen parkland.
Late may to mid July, most adults flying in mid to late June.
The robust body and dissimilar fore- and hindwing pattern of Pero species are more reminiscent of noctuids than geometrids.
Forewing light grey-brown with a broad wavy dark brown median band, shading to tan brown medially especially near the costa. Discal spot white. Hindwing light grey with a pale bordered, dark median line and a row of small black terminal dots. Wing margins slightly serrate.
Very similar to P. honestaria, with which it occurs in the central parts of the province. More dark speckling overall than P. morrisonaria, and the forewing median band with a more pronounced paler area near the costal margin. The outer margin of the forewing median band has a tooth-like indent near the anal margin (at the anal vein), while honestaria has a straight median band outer edge. In the southern mountains where several Pero species may occur it is best to confirm identification through genitalic morphology (see McGuffin 1987).
This is the most widespread and often the most common Pero in Alberta. The larva, like most ennomine geometrids, is a twig mimic. The pupa overwinters (McGuffin 1987). Adults are nocturnal and come to lights.
Not of concern.
Larvae are predominantly conifer feeders, especially balsam fir (Abies) and white spruce (Picea), but have also occasionally been recorded from willow (Salix), alder (Alnus), and aspen (Populus(Prentice 1963).
Coastal BC east to Nova Scotia, south to WA and Ga (McGuffin 1987, Wagner et al. 2001).
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