TORTRJCINA. 87 



ingly variable in colour. In some specimens the anterior wings 

 are of the various shades of brown, with a white blotch ; others 

 as above described, and all the intermediate varieties occur. 



The imago appears in June, July, and August, and occurs 

 throughout the country, and in Scotland. 



The pupa is 4 lines long, enclosed in a silken cocoon spun up 

 in moss, &c. ; is reddish brown at its anterior portion. The ab- 

 domen pale dusky brown. 



The larva feeds on the Birch, Hazel, Sallow, and Willow; 

 those feeding on the Birch roll the leaves into a cylinder at right 

 angles to the midrib, and eat the internal portion. It is of a 

 dirty white colour, with a slight shade of green ; is about 8 lines 

 long, with a black, shining head ; the shield also black, divided 

 by a pale dorsal line ; on the anal segment is a large, irregular, 

 semilunate black patch, with an oval spot of same colour on the 

 12th segment. The spots on the body elevated, oval, and con- 

 colorous. 



4. ophthalmicana, Hub. Alia anticis nigris nebulis atris ; maculis 

 duabus in margine dorsali, una basim versus atra, altera ad an- 

 gulum analem atroque ferruginea ; posticis fuscis. tf Exp. al. 

 10-11 lin. 



Head smoky black or obscure ochreous brown ; the scales of the 

 tuft tipped with grey. Face smoky black. Eyes black. Palpi 

 longer than the head ; above, at sides, and beneath, smoky black ; be- 

 tween dull ashy grey; terminal joint black. Antennae smoky black. 

 Thorax smoky black ; the tips of the scales grey, sometimes wholly 

 obscure ochreous brown. Patagia smoky black at the base ; the apex 

 with the tips of the scales grey. Anterior wings slightly glossy ; 

 smoky black, with glossy leaden grey streaks at the anal angle and 

 along the costa, which is obscurely marked with geminated streaks : 

 these streaks are sometimes of an obscure ochreous colour, at others 

 dark leaden grey. The apical spot is distinct, and streaky. On the 

 dorsal margin near the base is an irregular black blotch, tinged with 

 obscure ochreous, and within the anal angle, near the margin, is a 

 roundish obscure ochreous spot, edged with black. Apical scales 

 smoky black, with drab bases and grey tips. Cilia glossy smoky 

 black at and below the apex, then paler, becoming drab at the anal 

 angle, with pale grey tips. Posterior wings glossy pale umber, 

 darkest towards the margins. Marginal scales umber, with pale 

 bases. Cilia very pale grey, with a fuscous tinge. Abdomen glossy 

 pale grey ; the caudal tuft greyish drab. $ Exp. al. 10^-12 lin. 



Not a common insect : variable in the intensity of colour on 

 the anterior wings, and also a little as to size. In general ap- 

 pearance it resembles dark specimens of Retinia occultana, but 



