212 
BROWN HAIR-STREAK. 
The caterpillar is green, with yellow streaks along 
the hack, and transverse rays of the same colour on 
the sides. It feeds on the common birch, blackthorn, 
plum, &c. The fly appears about the beginning of 
August, but it is not often met with in this country, 
although abundant in most other parts of Europe. 
The following English localities may be mentioned, 
a few of which have afforded it in some plenty. 
Coombe-wood, woods near Ipswich, Reydon wood, 
Andover, Dartmoor, Devonshire. 
PURPLE HAIR-STREAK. 
Theda Quercus. 
PLATE XXVII. Figs. 3 & 4. 
Pap. QuercuB, Linn. — Leu: in. pi. 43 . — Donovan , xiii. pi. 
4G0— The Purple Hair-Streak, Harris . — Thecla Quercus, 
Sleph., Jermyn, & c. 
Rather a smaller species than the preceding, the 
extent of the wings being generally from thirteen 
to fifteen lines. The colour of the upper side is dark 
brown, the entire surface, in one of the sexes, faintly 
glossed with purple, and in the other there is a largo 
oblong patch of deep glossy blue at the base of the 
upper wings, divided posteriorly into two branches, 
the hinder one being prolonged towards the anal 
angle. On the under side the wings are pubescent, 
of an ash-grey colour with a silky lustre, and tra- 
