Surely, one of THE most respendent and unusual catocala
species to encounter in northern N. America is this one:
The White Underwing (Catocala relicta)
The common name derives from it being a white-colored
member of the Catocala clan. This is quite unique as most
all other species are varying shades of grey, brown, or black
on the forewings.
The species name (relicta) comes from the Latin "relictus"
which means forsaken, lost or abandoned --- a clear
reference to other common names it is known by such as
Forsaken Underwing or the Relict Underwing.
Adults have a wingspan typically between 70-80 mm. The
species is variable in its markings with the "whitest"
individuals being a named form ---clara. Other, more
salt & pepper colored individuals are known as form ---phrynia.
Yet, still there remain others which don't quite "fit" either of
those named forms.
The species lives in southern Canada but, may be found in
many of the "northern" states bordering Canada. It has worked its
way down a bit further in places. Here in Illinois it is rarely seen
or encountered and if so it appears localised.
Only recently, I was able to acquire 3 relatively fresh specimens
of this incomparable species (for which I am very grateful). These
are Canadian in origin and are mighty special when one cannot
typically find or collect any oneself !