Ottawa (Dunrobin), ON Canada

10 July 2004   1:15AM EST  (top)
21 August 2004   1:15AM EST  (bottom)

Heterophleps triguttaria is a small geometrid, with a wingspan from 1.8 to 2.4 cm (Covell, 1984).  The wings are of a creamy yellow-tan color.  The head, thorax and abdomen are the same color as the wings.  Three dark brown patches are spaced along the costa of the forewing, with the patch closest to the apex being significantly smaller than the other two.  Sometimes there are a few brown dots marking the curves of the antemedial and postmedial lines.

According to Handfield (1999), the host plant for Heterophleps triguttaria is maple. He indicates an adult flight season from about the end of May to mid-August for my general area.

My records to date for Heterophleps triguttaria (each date representing "the night of") are in the table below: