Ottawa (Dunrobin), ON Canada
July 2002 11:59PM EST (top left)
9 July 2001 3:20AM EST (top right)
20 July 2002 11:16PM EST (bottom)
At rest, Peridea
basitriens often holds its wings in a fairly flattened position, and
sometimes the forward edge of the hingwing, which may have a somewhat hairy
appearance, protrudes a little beyond the folded forewing as in the first
photo above. Covell (1984) has called this species the Oval-Based Prominent,
in light of the elliptical pattern in the basal area of the forewing, often
accented with orange/brown. The rest of the forewing is generally
gray, and the veins are usually clearly visible outside the postmedial line
in the subterminal area. A black tuft projects from the inner margin,
but can be hard to distinguish with the wings closed; this tuft is not at
all obvious in the photo at top left, but can be recognized in the top right
photo if you know that it's there.
Handfield (1999) indicates that the larva
of Peridea basitriens feeds on elm and on sugar maple, both of which
are plentiful at my location.
I have photographed this species in 2000
on 19 and 28 July; in 2001 on 30 June and on 5 and 9 July; in 2002 on 11 and
19 June, and on 10 and 12 July.