S-1141001_COMPLETO.pdf

CHEQUERED WHITE. 27
one was taken in June in White Wood, near Gamlingav, Cam-
bndgeshire. Stephens captured-one on the 14th. of August,
1818, in the meadow behind the Castle of Dover, where others
have since been taken by Mr. Le Plaistrier, of Dover. My
excellent friend, J. C. Dale, Esq., has also recorded the capture
of one about the same time near Bristol.
Two broods occur in the year, the earlier one in April and
May, and the latter in the end of July and August.
The caterpillar feeds upon wild woad, base rocket, and wild
cabbage, and various species of Reseda and cruciferous plants.
It is described by Boisduval as being of a bluish ash-colour
above, and on the sides covered with small black raised dots,
and with four white stripes along the sides; beneath, whitish,
as are the legs, each with a yellow spot above it.
The chrysalis is greyish, dotted with black, with several
reddish stripes.
This fly varies in the expansion of its wings, from not quite
an inch and three quarters to nearly two inches. The wings
are white, with a shade of cream-colour. The fore wings,
which are unusually pointed, the outer margin being slightly
concave, are blackish at the base, and there is a rather large
black spot about the centre of the wing, where the transverse
veins appear of a white colour. The tip is irregularly marked
with black, irrorated with white, which is widest towards the
front margin; the black patch is also marked with four irregular
white spots. The hind wings are white, the markings of the
under side shewing faintly through.
Underneath, the marks of the fore wings are of a greenish
colour, and there is a spot on the inner edge. The hind wings
are yellowish green, with three large white spots, forming a
triangle towards the outer corner of the wing, succeeded by an
irregular white bar beyond its middle, crossed by yellowish
veins and with five white club-shaped spots on the outer
margin.
In the female the black patch on the fore wings, which are
of a convex and rounded form, is darker than in the male, and
there is another small black patch near the inner margin. The