TORTRICINA. 159 



nervures not equidistant; the discoidal cell situated towards the centre 

 of the wing but not extending two-thirds its length. Posterior wings 

 obovate ; apex obtuse ; apical and dorsal margins entire, the anal 

 angle slightly produced. Abdomen long and slender, tufted at the 

 apex in both sexes. 



Although in some respects differing in its characters, we con- 

 sider this genus locates well with the Peroneida, and like them, 

 the perfect insect appears late in the autumn. The smooth costa 

 and non-tufted anterior wings sufficiently remove it from any of 

 the succeeding genera. 



There is at present but one known British species. 



1. mixtana, Hub. Alis anticis argenteo-niveis ; castaneo irregu- 

 lariter marmoratis ; posticis griseis. tf Exp. al. 7-8J lin. 



Head and face rich chocolate -brown. Eyes black. Palpi rich 

 chocolate-brown above, at sides, and between at the tips ; white at 

 the base, between and beneath. Antennae shining deep fuscous ; the 

 basal and few succeeding joints chocolate-brown. Thorax chocolate- 

 brown, sometimes irrorated with white behind. Patagia : the basal 

 half chocolate-brown, the apical half white. Anterior wings glossy 

 silvery white, broadly and variedly marked with chocolate-brown, 

 with the costa reddish on the edge. The markings generally present 

 are : a patch at the base, mixed with white, a very oblique, variously- 

 formed central fascia, extending from before the middle of the costa 

 and dilating irregularly in its course to the anal angle, where, in 

 dark specimens, it unites with a large cloud or patch, which occupies, 

 more or less, the dorsal margin ; very frequently the fascia is inter- 

 rupted; the subapical costal patch is large and trigonate: these 

 marks all chocolate, more or less speckled with white ; the apical 

 margin mottled with the same colour and white ; the disk of the 

 wing, especially towards the apex, is freckled with black spots of 

 various sizes. Apical scales reddish, mottled with white and pale 

 bases. Cilia white, merging into grey at the anal angle ; reddish at 

 the apex. Posterior wings shining grey, slightly fuscous at the apex, 

 and sometimes with the black freckles on the under side showing 

 through. Marginal scales slightly fuscous, with paler bases. Cilia 

 sometimes white, but usually grey. Abdomen dark fuscous ; the 

 apex subochreous. $ Exp. al. 6-8 lin. 



A beautiful and very variable species, the variation consisting, 

 however, of the greater or less preponderance of the silvery 

 white ground-colour, or of the chocolate-coloured markings ; 

 some specimens, although very rare, are wholly white, others, 

 more commonly, wholly brown ; speckled instances occur be- 

 tween these two extremes in all gradations. The uniformly 

 brown examples are the Tortrix castaneana of Haworth. 



