dull
yellow, lightly powdered with black scales.

The _butterfly_ is seen during nearly the whole of the summer, and is found
almost everywhere.

* * * * *

THE GREEN-VEINED WHITE BUTTERFLY. (_Pieris Napi._)

(Plate IV. fig. 4.)

Is so called from the greenish tint that _often_ borders the veins or
nervures on the _under_ side of the _hind_ wing; but the name is _not
always_ an appropriate one, for a large proportion of the specimens met
with have the veinings grey, and not at all green; but the fact is, that
the ground colour varies greatly, from creamy white to full buff, or bright
clear yellow; in the latter case it is, that the minute black scales which
border the course of the nervures, covering over the yellow, produce a
grey-green effect on the eye.

The size also is very variable. I have a specimen that expands two inches
and two lines across, from tip to tip, and have seen another not larger
than a small Copper butterfly--little more than one inch from tip {87} to
tip. The intensity of the dark markings, on both the upper and under sides,
is also subject to much variation.

But, under all these circumstances, the presence of dark cloudy veins on
the under side--appearing, but less distinctly, on the upper side--will at
once distinguish it from the last species, the only one with which it can
possibly be confounded.

The _male_ has only _one round spot_ on the _front_ wings; the _female_
being marked as in the plate.

Both in woods and cultivated grounds we meet with this butterfly commonly
enough, most abundantly in May and July, though it may be found from April
to August.

The _caterpillar_ feeds on the same tribe of plants as the two last, but is
supposed to be especially attached to the Rape (_Brassica Napus_), whence
its specific name. Its colour is green, with yellow spots round each
spiracle, which is itself tinged with red.

Two varieties of this were formerly ranked as distinct species, under the
name of _P. Sabellicae_ and _P. Napae_.

* * * * *

{88}

THE BATH WHITE. (_Pieris Daplidice._)

(Plate IV. fig. 5, Female.)

Of all the members of this white-winged genus that inhabit Britain, this is
at the same time the most beautiful and the rarest. The capture of a Bath
White is an entomological "event," and the day thereof is a red-letter day
in the fortunate captor's life.

On the opposite coast of France, however, and