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Ottawa (Dunrobin), ON Canada
18 April 2007 11:24PM EDT (top)
26 April 2007 11:03PM EDT (bottom left)
5 May 2006 11:23PM EDT (bottom right)
Lycia ursaria, sometimes called the Stout Spanworm Moth, is one of
two species of Lycia
recorded from the Ottawa area. My
initial identification of Lycia ursaria was based on Covell (1984) and
Handfield (1999), with additional information obtained from McGuffin, W.C.,
"Guide to the Geometridae of Canada (Lepidoptera), II. Subfamily
Ennominae. 2", Memoirs of the Entomological Society of Canada,
no. 101 (Ottawa: 1977).
The forewing of Lycia ursaria is gray-brown, with a
mixture of light gray and darker gray-brown scales. The dark gray
antemedial line curves slightly outwards in the middle. The dark gray
medial line angles outwards and is typically heaviest near the costa, then bends
inward to follow a slightly sinuous course to the inner margin. The
postmedial line bends inward to approach and then parallel the medial line from
a little more than halfway down the wing to the inner margin. The area beyond
the pm line is divided by a fairly wide line or band of pale gray. The
hindwing is pale gray, with darker gray medial and postmedial lines and a
subterminal shade heaviest at the inner margin. Both forewing and hindwing
fringes are checkered light and dark gray. The abdomen is stouter than is
usual among geometrid moths, and is thickly covered with gray-brown hairs, its
bear-like "fur" doubtless giving rise to the species name ursaria.
McGuffin (1977) indicates a wing expanse of 40 to 47 mm.
According to Handfield (1999), the larva of Lycia ursaria
has been reported to feed on many plants, including dogwood, ninebark, birch,
willow, alder, basswood, poplar, elm, ash, apple, blueberry, maple, cherry and
others. For the area of Quebec adjacent to my part of Ontario, he indicates the adult moth flies in
April, but my observations suggest a flight season from about mid-April nearly
to mid-May for my location.
My records to date for Lycia ursaria (each date
representing "the night of") are in the table below: |