Ottawa (Dunrobin), ON Canada

19 May 2001   10:07PM EST  (top left)
27 May 2002   10:47PM EST  (top center)
19 May 2001   10:01PM EST  (top right)
30 May 2002   11:37PM EST  (bottom)

The two photographs at top left and top right are of the same specimen.

Resting specimens of Clostera albosigma characteristically hold their wings close to and almost rolled around their bodies, as in most of the photos above.  Looking sideways at the moth at rest, however, you can still see the prominent S-curve of the postmedial line just below the costal edge of the forewing, with shades of rust and darker gray or gray-brown in the subterminal area.  The whitish lines crossing the forewing appear more or less parallel on the resting moth, making it easier to distinguish from Clostera apicalis (7901), which also occurs in my area.

The larvae of Clostera albosigma generally feed on poplar and willow species, and according to Handfield (1999), construct large communal tents in their host trees.  There are two generations, in spring and summer.

I have photographed this species in 2001 on 19 May; in 2002 on 27 and 30 May, on 8 and 18 June, and on 30 July.