TORTRICINA. 193 



The following table is constructed for the arrangement of the 

 eight British species. 



A. Anterior wings with a white or whitish blotch on 



the dorsal margin Species 1-3 



B. Anterior wings with an obscure streaked blotch on 



the dorsal margin Species 4-6 



C. Anterior wings with & pale fascia more or less di- 



stinct beyond the basal patch Species 7-8 



1 . Populana, Fabr. Alis anticis brunneis obscuris ; costa postice 

 aureo atroque punctata ; macula medio marginis dorsalis sub- 

 quadrata alba ; posticis fuscis obscuris. tf Exp. al. 5i lin. 



Head dusky brown, paler in front. Face dusky brown, paler below. 

 Eyes black. Palpi as long as the head, drab above, grey beneath, 

 whitish between. Antennae deep brown and glossy. Thorax and 

 patagia fuscous, the latter paler at the apex. Anterior wings glossy, 

 wholly suffused with rich reddish brown, with lustrous blue streaks 

 and a sulphur- coloured blotch upon the dorsal margin ; the base, 

 especially towards the costa, with a violet tinge, merging into rich 

 glossy chestnut-brown to the anal angle. The costa is marked with 

 seven oblique geminated streaks, of which the first and third from 

 the base, are longest and of a lustrous blue colour ; towards the apex 

 these streaks are of a golden lustre, and short, with rich brown 

 markings between; at the apex is a distinct, eye-like spot. The 

 apical portion of the wing rich brown, with a reddish, metallic lustre, 

 and speckled with golden markings ; in certain lights these latter 

 have a violet tinge, especially those constituting the ocelloid patch, 

 in which are some strongly-marked, longitudinal, black lines. The 

 dorsal blotch is sulphur-yellow, somewhat triangular, and produced 

 at its apex, with an elongated mark, and a smaller one on the 

 margin. In general appearance it is not unlike the letter Y. Apical 

 scales umber. Cilia fuscous. Posterior wings rich chestnut-brown, 

 with a violet tinge ; marginal scales of similar colour, the bases 

 paler. Cilia fuscous. Abdomen shining, deep brown. 



An uncommon species, and does not vary ; smaller than Ha- 

 lonota tetragonana, but of the size of Semasia spiniana. It is 

 distinguished from the former by the more distinctly-geminated costa, 

 and the defined, triangular Y-shaped mark on the dorsal margin ; 

 from the latter, which it most resembles, by the black mark in 

 the middle of the dorsal blotch, which is wanting, or very faintly 

 expressed in S. spiniana. 



The imago appears in July, August, and September, among 

 Sallows, in the Metropolitan district. 



The larva is active, 3^ lines in length, of a translucent, whitish- 

 green colour, and isometric in shape ; the head jet-black, heart- 



o 



