TORTRtCINA. 319 



equidistant all inserted beyond the middle of the subcostal vein. 

 Discoidal cell very capacious, widest before the apex, lying towards 

 the middle of the wing, and extending fully two-thirds its length. 

 Posterior wings elongate ; apex obtuse ; apical margin very concave ; 

 anal angle somewhat produced. Abdomen slender, stouter in the 

 ; a small tuft at the apex in both sexes. 



The only British species in this genus is distinguished from 

 all other Tor trices in our list by the bright pearly, silvery-lustred 

 ground-colour of the anterior wings : in the character of its 

 markings it approaches Dapsilia. 



The larva is unknown, but supposed to feed on the roots or 

 stems of some herbaceous plant. 



1. dipoltella, Hiib. Alis anticis argenteo-margaritaceis ; fasciis qua- 

 tuor obliquis pequidistantibus ochraceis ; posticis cinereis. 3 Exp. 

 al. 5i-7| lin. 



Head bright ochreous ; paler on the vertex. Face pale ochreous. 

 Eyes black. Palpi as long as the head ; primrose -colour above and 

 between ; ochreous at the sides and beneath. AntennaB drab, annu- 

 lated with brown ; basal joint clothed beneath with ochreous scales. 

 Thorax bright ochreous at the sides, with a narrow, whitish, longi- 

 tudinal line in the centre ; a large black spot behind the crest ; 

 the crest bifid, white at the base, and ochreous at the apex. Patagia 

 ochreous ; darkest at the base, edged outwardly with white. Ante- 

 rior wings bright, shining, pearly white, with ochre-coloured, oblique 

 streaks and spots ; the costa widely and finely maculated with iron- 

 grey. At the base of the costa is an angulated ochreous patch, 

 followed by four oblique, similar- coloured streaks, all placed in a 

 manner parallel with the apical margin, and extending from the 

 costa to the dorsal margin : that nearest the base is curved, the 

 second furcate on the costa ; the third sometimes dilated on the 

 costa and furcate towards the dorsal margin, and at others emitting 

 a branch posteriorly, which branch is sometimes represented by a 

 spot ; the last, or apical, streak curves inwards, leaving two semi- 

 lunate, pearly spots on the margin ; between the third and last 

 streaks on the costa is a rounded spot, and another one, triangular, 

 within the anal angle on the dorsal margin : all these markings are 

 of deep ochreous, with paler edges, and are dull ; in fine specimens 

 giving them the appearance of being laid ON the surface, instead of 

 forming a part of it. Apical scales ochreous, with pearly bases, the 

 supercostal ones mixed with grey. Cilia pale drab, with a faint 

 rosy hue. Posterior wings dull, dark grey, with a faint violet tinge. 

 Marginal scales paler, with whitish bases. Cilia glossy, white. 

 Abdomen shining, grey; the apex straw-coloured. $ Exp. al. 

 7-8 lin. 



