20 TORTRICINA. 



pale drab. Cilia drab, mottled with umber-coloured scales. Posterior 

 wings shining, clothed with coarse fuscous scales on a light-grey 

 ground ; marginal scales fuscous, with luteous bases. Cilia white. 

 Abdomen and caudal tuft fuscous. $ Exp. al. 8-9 lin. In colours 

 and markings resembles the $ . 



An uncommon insect, and does not vary. It is very like a 

 pale-coloured Antithesia corticana, but may be distinguished 

 from it by the ground-colour of the anterior wings, which is 

 pale drab, instead of white, and by the interrupted medial fascia, 

 which in the latter insect is entire. 



The imago makes its appearance in August ; and latterly it 

 has been taken near Lea Bridge, from the trunks of Willows. 

 Stephens, in his ( Illustrations, Haust./ vol. iv. p. 86,says it is "not 

 common ; taken occasionally within the metropolitan district in 

 July ; also in Devonshire." It has been bred by Mr. Thomas 

 Boyd, from pupse found by him, spun up between Willow-leaves. 



Genus VI. ANTITHESIA, STEPHENS. 



Antennae setaceous, inserted in front over the eyes, clothed with 

 scales above, pubescent beneath. Palpi longer than the head; 

 basal joint short, stout; apical oval, minute, not so long as the 

 basal, clothed with short scales ; middle four times as long as the 

 apical, stout, thickening from before the middle, and clothed beneath 

 with long scales. Maxillae longer than the palpi. Thorax stout, 

 ovate, with a bifid tuft behind. Anterior wings : length more than 

 twice the breadth ; costa regularly arcuated ; apex obtuse ; apical 

 and dorsal margins rounded. The discoidal cell extends beyond the 

 middle of the wing, and the subcostal vein gives out an internal 

 nervure, inserted between the first and second subcostal nervures, 

 which crosses to the apical vein between the first and second apical 

 nervures. Posterior wings ovate ; apical margin concave below the 

 apex. Abdomen in the <$ slender, and tufted at the apex ; stout in 

 the $ , and not tufted. 



The insects associated in this genus form a very natural 

 group, the Iarva3 for the most part feeding upon the leaves of 

 various shrubs and trees ; some of them (A. Gentianana arid mar- 

 ginana) are internal feeders, and a more intimate knowledge of 

 the preparatory states of the family may hereafter warrant the 

 erection of a separate genus for the reception of the latter. In 

 repose the wings are very much deflexed. 



The British species are fourteen in number, as tabulated 

 below, and some others are known on the Continent. 



