Ottawa (Dunrobin), ON Canada

14 July 2002   10:50PM EST  (top left)
16 July 2002   12:50AM EST  (top right)
11 June 2002   2:25AM EST  (bottom)

Lochmaeus bilineata is the more common of two similar species of Lochmaeus that may occur in my general area, and the only one I have observed to date.

The forewing of Lochmaeus bilineata is gray to brownish gray, darkest in the median area.  The antemedial and postmedial lines are quite distinct, broadly scalloped, but with a sharp bend adjacent to the costal edge (bottom photo).  These lines are black next to the median, but edged with pale gray on the side away from the median.  In the bottom photo, a similar basal line can also be seen.  The reniform spot is somewhat indistinct, but shows in the median as a black mark inside a bent oval of lighter gray.  The area between the faint subterminal line and the postmedial line is shaded with darker gray, especially near the costa.  The hindwing is also gray.

The larvae of Lochmaeus bilineata feed on a variety of deciduous trees, including elm, birch, beech, oak and basswood.  Handfield (1999) indicates a flight season from early June to early August in my general area.   

I have photographed this species in 2002, on 11 June, on 6, 14 and 16 July, and on 9 August.