211 



BROWN HAIR-STREAK. 



Thecla Betulee. 



PLATE XXVII. Figs. 1&2. 



Pap. Betulae, Linn. — Lewin, pi. 42 Donovan, viii. pi. 



250. 2 — Brown Hair-Streak, Harris. 



This is the largest British species of the present 

 group, the expansion of the wings sometimes reach- 

 ing eighteen lines. The colour of the upper side is 

 dark brown, with a silky gloss, the fringe whitish ; 

 towards the middle of the anterior wings there is a 

 blackish ill-defined mark, usually with a faint yellow 

 cloud beyond it in the male, and a large kidney-shaped 

 orange patch in the female. The secondary wings 

 in both sexes are covered with fine silky hairs inter- 

 nally, and the two projecting lobes at the anal angle 

 are marked with reddish-yellow. The under side is 

 entirely tawny yellow, inclining to red at the hinder 

 extremity, particularly of the posterior wings, with 

 two narrow transverse undulating white lines, edged 

 with black, the anterior one abbreviated, and form- 

 ing only a dusky streak on the upper wings, edged, 

 with white. The antennae are ringed with white 

 and the apex of the club is rust-red. 



