Ottawa (Dunrobin), ON Canada

30 July 2000   1:21AM EST  (top left)
19 June 2002   11:35PM EST  (top right)
26 July 2001   1:11AM EST  (center left)
10 August 2002   1:10AM EST  (center right)
28 July 2002   12:40AM EST  (bottom left)
28 July 2000   12:49AM EST  (bottom right)

Peridea angulosa often rests with its wings fairly flat as in the center two photos above, but sometimes holds its wings close to the body in the shape of a peaked roof, a characteristic pose for many species of Notodontidae.  Its forewings are gray and somewhat mottled, often with a lighter patch in the medial area near the costa.  According to Covell (1984), the zigzag antemedial and postmedial lines are double, black and filled with orangish brown; in most of the specimens observed at my location, these lines are also accented with touches of white.  About halfway down the inner margin of the forewing, there is a projecting tuft of black scales, most evident when the wings are open (top left) but sometimes also visible in a wings-closed position (bottom right).

Although the hindwing is mainly plain grayish to whitish, the forward edge of the hindwing is patterned like the forewing.  In the moth's flattened closed resting position, this edge often projects out from beneath the forewing so that this pattern extension is visible, as in the two center pictures above.

The larvae of Peridea angulosa feed on oak.  In my area the adult moth is most frequently observed in July, but may also be seen in June and August (Handfield, 1999).

I have photographed this species in 2000 on 28, 30 and 31 July; in 2001 on 24 June and on 21, 24 and 26 July; in 2002 on 19 June, on 1, 17, 18, 20, 21, 24, 25, 27 and 28 July, and on 5, 10 and 14 August.