WHITE LETTER HAIR-STREAK. 145 



to capture some hundreds of them, had one been so 

 disposed ; for the last few years it has appeared very 

 sparingly indeed." It has also been found in the fol- 

 lowing localities : — Overton Wood ; Brington, Hunting- 

 donshire ; and Monks Wood, Cambridgeshire. 



THE WHITE LETTER HAIR-STREAK. 



(Theda W. Album.) (Plate XII. fig. 3.) 



This is very much like the last in appearance, and 

 has often been mistaken for it by inexperienced eyes. 

 The points of difference are — on the upper side, the 

 absence of the orange band at the hinder edge of the 

 hind wings, and the presence of a bluish grey circumflex 

 line at the inner angle; here aLc is sometimes a small 

 orange dot ; — beneath, the orang*. vand forms a series of 

 arches, bounded on the edge i, rarest the root of the 

 wing by a clear black line instead )f the rounded black 

 spots seen at this part in Pruni. 



The caterpillar, which feeds on the elm, is wood- 

 louse shaped; pea-green, barred with yellow; head 

 black. May be beaten off elm trees in May. 



The butterfly appears in July, and is found in various 

 situations, sometimes flying high up round elm trees, 

 eometimes descending to bramble hedges, or fluttering 



