TORTRJCINA. 103 



The British species are nine in number (several more are re-- 

 cognized on the Continent), and are arranged as in the follow- 

 ing table : 



A. Anterior wings with a pale sulphur-coloured, 



curved tooth-shaped blotch on the dorsal margin . Species 1 



B. Anterior wings with a pale sulphur- coloured, tri- 

 angular blotch on the dorsal margin Species 2 



C. Anterior wings with a rich yellow (sometimes 



dusky) tooth-shaped blotch on the dorsal margin . Species 3, 4 



D. Anterior wings with an indistinct triangular, or 

 curved tooth-shaped blotch on the dorsal margin, 

 slightly p a ler than the rest of the wing ; never yellow 



or sulphur -coloured Species 59 



1. Petiverella, Linn. Alis anticis aureo-brunneis, fusco-strigatis, 

 macula dorsali curva flava, strigulis costalibus geminatis albidis ; 

 ad angulum analem punctis atris ; posticis aureo-fuscis. tf Exp. 

 al. 4i-6| lin. 



Head dusky olive-brown. Face slightly paler. Eyes black. Palpi 

 longer than the head ; apex smoky grey, or dull brown ; bases, sides, 

 and beneath, dull ochreous. Antenna3 glossy, fuscous. Thorax 

 pale, dull olive -brown. Patagia of same colour, but paler at the apex. 

 Anterior wings : pale olive-brown, with an ashy tinge, especially at 

 the base ; the dorsal margin with a curved tooth-shaped sulphur- 

 coloured blotch, its apex turned posteriorly ; the costa with similar 

 coloured streaks beyond the middle, which are mostly geminated, 

 but sometimes simple ; below them are two oblique bright lustrous 

 blue lines. The subapical portion of the disk sometimes clouded, or 

 streaked with ochreous, either with or without black spots or longi- 

 tudinal black stripes therein. On the apical margin, towards the 

 anal angle, are three or four black spots, edged anteriorly with 

 ochreous. Apical scales short, and smoky grey. Cilia glossy, dark 

 grey or brown, with yellowish bases. Posterior wings glossy, golden 

 brown or coppery, darkest towards the margin, and bordered narrowly 

 with yellow at the apex. Marginal scales iron-grey, with yellow 

 bases. Cilia grey at the apex (paler anteriorly), with paler, bases. 

 Abdomen fuscous, the caudal tuft dusky drab. $ Exp. al. 5-6| lin. 



An abundant species ; variable in size, and a little so in colour. 

 Allied to D. sequana, but is larger, and the pale dorsal blotch is 

 more crescent-shaped, and narrower. 



The imago appears in June and July, flying in the sunshine, 

 wherever the food-plant of the larva grows. It is generally distri- 

 buted over the country, and occurs also in Scotland and Ireland. 



The larva is from 4 to 5 lines long, of sluggish habit, and of 

 a pinkish-white colour. The head is luteous, shining, and the 



