the same locality for
thirteen years subsequently, sometimes in the season for a month together,
I have not since seen a single specimen there; but in 1833 I caught one
specimen at Madingley Wood, near Cambridge."

Other localities:--Near Sheffield; Roche Abbey; York; Peterborough; near
Doncaster; Polebrook, Northants; Allesley, Warwickshire; Brington,
Huntingdonshire; Yaxley and Monks Wood, Cambridgeshire; Needwood Forest,
Staffordshire; Wolverston, near Ipswich; Chatham; Southgate, Middlesex;
West Wickham Wood; Epping; Bristol.

* * * * *

{145}

THE PURPLE HAIR-STREAK.(_Thecla Quercus._)

(Plate XII. fig. 4, Male; 4 _a_, Female.)

At once the commonest and the handsomest of the Hair-streaks, being found
in almost every part of England where there is an oak wood, and looking
like a small Purple Emperor, with its rich gloss of the imperial colour.

The _male_ has all the wings, in certain lights, of a dark brown colour,
but with a change of position they become illuminated with a deep rich
purple tint, extending over the whole surface excepting a narrow border,
which then appears black. The _female_ has the purple much more vivid, but
confined to a _small patch_ extending from the root to the centre of the
front wing. Beneath, the wings are shaded with greyish tints, crossed by a
white line on each wing, and having _two orange spots_ at the inner corner
of the hind wing.

The _caterpillar_ (Plate I. fig. 9), which feeds on the oak, is reddish
brown, marked with black.

The _chrysalis_, which is sometimes attached to the leaves of the oak, and
at others is found _under the surface of the earth_ at the foot of the
tree, is a brownish object, of the lumpy shape shown in Plate I. fig. 28 (a
form shared by the chrysalides of all the Hair-streaks). {146}

The _butterfly_ is seen in July and August, flitting about in sportive
groups round oak trees, and occasionally descending within reach of the
net. It also affects other trees besides oaks, some thirty or forty at a
time having been seen gambolling about one _lime_ tree. It being so
generally distributed, it will be needless to particularize its localities.

* * * * *

THE GREEN HAIR-STREAK. (_Thecla Rubi._)

(Plate XII. fig. 5.)

This pretty little species is at once known from all other English
butterflies by the rich _bright green_ colour that overspreads its under
surface. Above, the wings ar