A correspondent has correctly identified this as G. rhamni, not
farinosa.
Note the concave costa - this should be straight or convex in
farinosa.
Pelopennesos,
Greece, June 2002 (m)
Yellower
forewing, greener hindwing may be visible here.
Natural
History Museum, London (m)
Roughened
forewing and antennal clubs pink
Natural
History Museum, London (m)
Reduced
hindwing hook and deeper scallops of inner margin.
These photos are of the Powdered Brimstone. Don't
believe me??? They were taken in southern Greece in very hot conditions.
They would not settle long enough to get any reasonable photos and when
they did feed long enough they were always at a poor angle.
They are very similar to the Brimstone, G. rhamni. Compared to
rhamni, key differences (some are illustrated above) for farinosa
are:
Wing shape: hindwing inner margin has two deeper scallops from
the less prominent "hook". Forewing costa is gently
curving to the wing tip, rhamni is straight for much of the
wingspan.
Texture: the male forewing is roughened by scales giving it a
dulled texture; rhamni has very short neat scales giving a shiny
appearance. This is only visible on caught specimens both
butterflies never rest with their wings open.
Male upperside forewing is allegedly yellower than the greenish
hindwing - perhaps this is visible in the photo above. This was
visible in flight but would not have been sufficient to identify it
alone.
Antennal clubs pink.
rhamni is widespread across much of Europe, farinosa
is only in the southern Balkans, especially Greece.
