211 
BROWN HAIR-STREAK. 
Thecla Belulce. 
PLATE XXVII. Figs. 1 & 2. 
Pap. Betulae, Linn — Lew in, pi. 42. — Donovan, viii. pi. 
230-5 — 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 
W'ith black, the anterior one abbreviated, and form- 
ing only a dusky streak on the upper w'ings, edged, 
with white. The antennae are ringed with white 
and the apex of the club is rust-red. 
