Ottawa (Dunrobin), ON Canada
Pyreferra citromba is the less common of the
two species of Pyreferra known to occur in the Ottawa area. It
is a pale straw yellow in color, with well-defined brown lines. The
antemedial, medial and postmedial lines are all quite straight. At the
costal end, the postmedial line looks as if it has run into an irregular U-
or V-shaped line, the ends of which terminate at the costa. In the
specimen above, the reniform spot is only faintly present, but the orbicular
spot is evident on the left wing as a hollow brown circle.
this species overwinters as an adult, it is likely that specimens seen in
the spring are somewhat worn, so that some markings may be fainter or
absent, as compared to a fresh specimen. The loss of wing scales due
to wear can also affect the color. Caution is needed, therefore, in
distinguishing similar species when the specimens are not fresh, for
example, Pyreferra citromba and Pyreferra pettiti (9932), both
of which occur in my area.
The larvae of Pyreferra citromba
feed on hazel and witchhazel. To the best of my knowledge, witchhazel
does not grow in my area, but there are plants of beaked hazel (Corylus
cornuta) in my immediate vicinity. Handfield (1999) indicates
adult flight seasons from mid-April to mid-May and from mid-September
through October in my general area. This moth hibernates as an adult
through the winter.
I have photographed this species only once,
in 2003 on 28 April.