15 



men in considerable detail (" Ent. Mo. Mag.," xlii, p. 6), but as 

 even the small number of individuals that I have reared show some 

 variation, and as the female differs very considerably from the male, 

 which alone he had to describe, some further notes under these 

 heads may not be out of place. 



Imago. 



Tortrix pronabana is easily recognised by the bright orange 

 colour of its hind wings, which at once distinguishes it from all its 

 allies that are known to occur in Britain. The male measures from 

 15 mm. to 17 mm. in expanse. Fore wings warm greyish-brown, 

 faintly reticulated with darker brown, with a broad, rich red-brown 

 fascia from the middle of the costa, where it is narrowest, to the inner 

 margin, where it broadens out, extends to the anal angle, and unites 

 with an irregular triangular patch of the same colour that occupies 

 the apical and hind marginal areas. There is also a dark shade on 

 the inner margin between the fascia and the base of the wing. The 

 reticulations on the darker markings have a distinct bluish colour 

 when seen in a bright light. Hind wings bright orange, bordered 

 with black, with a few black scales scattered along the veins. Cilia 

 of the fore wings, brownish orange ; of the hind wings pale orange. 

 Body ringed with orange. 



The female is a larger and more sombre insect. It measures 

 iS mm. to 22 mm. in expanse, is slightly paler in colour than the 

 male, and the reticulations are more clearly denned. The brown 

 fascia is of a duller and less reddish tone, and its central portion is 

 often indicated only in outline, as is also the triangular patch of the 

 apical and hind marginal regions. The cilia of the fore wings are 

 brown from the apex for about two-thirds of their distance, where 

 they shade into orange towards the anal angle. Those of the hind 

 wings are orange. The orange rings of the body are more distinct 

 than in the male. The female, when at rest, might easily be passed 

 over as a pale example of Tortrix heparana. 



There is little variation in the fore wings, beyond one individual 

 being slightly darker or lighter than another ; but the black scaling 

 of the hind wings is subject to very considerable modification, 

 chiefly in the males. In the paler examples the black border is 

 represented by a slender line, just within the fringes, and any 

 further black scaling is hardly discernible. In other specimens the 

 border is broad, and black scales are scattered along the veins ; 

 while in the darkest individual the black scaling spreads over the 

 wing so thickly as to almost obscure the orange colour. I ought to 

 mention that the material I had to work upon in framing these 

 remarks consisted of less than a dozen specimens, and it is quite 

 possible that a longer series might show further variation. 



