A section of _Pieris_ has lately been established as a genus under
the above name, founded, however, on characters not of a very
decided description. The most important one perhaps is the shape of
the chrysalis, which is boat-shaped, or equally attenuated to both
extremities, somewhat arched, and without lateral points. The antennæ
of the perfect insect are short, with the articulations distinctly
marked, the club rather abrupt and forming an ovoid compressed mass.
The common British species _Mancipium Cardamines_ is referred to it,
and this insect may be regarded as a characteristic example of the
kinds which it includes. Like the _Orange-tip_, the majority have a
patch of bright red on the tips of the anterior wings, and the under
side of the posterior is often beautifully marked with green and pearl
white. Several other species, besides that just mentioned, are natives
of Europe, but their principal resort seems to be the intertropical
countries of Africa.