212 BROWN HAIR-STREAK. 



The caterpillar is green, with yellow streaks along 

 the back, 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. 



Thecla Quercus. 



PLATE XXVII. Figs. 3 & 4. 



Pap. Quercus, Linn. — Letcin, pi. 43. — Donovan, xiii. pi. 

 460 — The Purple Hair-Streak, Harris. — Thecla Quercus, 

 Steph., 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 large 

 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- 



