TORTRICtNA. 43 



This genus, with the following (Lozotaema), may be said to 

 comprise the commonest and most generally-known and distri- 

 buted species in the family, and fairly represent its type. In the 

 early spring months, up to May, their larvae literally abound; 

 not a plant, shrub, or tree, but affords food for great numbers of 

 them. The ravages of the larvse of T. viridana in our Oak and 

 Hornbeam woods are too well known to be commented upon ; 

 nor can the larvse of T. Ribeana, heparana, and some others, be 

 said to be scarcely less numerous, although their ravages are 

 never so decided. From their vast numbers, these larvae perform 

 a very important office in the economy of Nature, by affording 

 food to many of our birds, which appear to live on nothing 

 else whilst they are to be met with. 



In this genus we find the type of the venation in the wings, 

 but the structure of the palpi presents no peculiarity. 



There are ten British species in this genus, which are ar- 

 ranged in the following order : 



A. Anterior wings in the $ semilanceolate. 



a. Anterior wings unicolorous Species 1 



6. Anterior wings unicolorous in the tf , but fre- 

 quently fasciated in the $ Species 2 



B. Anterior wings unicolorous, wings of the $ not 



differing from those of the tf Species 3 



C. Anterior wings of sober colours, with darker fascice 



and spots Species 4-10. 



1. icterana, Frol. Alis anticis griseis vel stramineis; posticis pallide 

 fusco-griseis. tf Exp. al. 11-12 lin. 



Head tawny or ochreous. Face ochreous. Eyes black, slightly 

 shining. Palpi : above ochreous, inclining to ferruginous, paler 

 between ; at sides ochreous, darkest at apex, yellowish beneath. 

 Antennae : above varying from straw-colour to fuscuos, alternated 

 with brown, fuscous beneath; basal joint clothed with tawny or 

 ochreous scales. Thorax tawny or ochreous, sometimes irrorated 

 with iron-grey scales ; in front narrowly ochreous. Patagia coloured 

 like the thorax, but with their apices paler. Anterior wings dull 

 straw-colour, inclining to ochreous at base ; sometimes the wings 

 are grey, irrorated with straw-coloured scales. Apical scales 

 pale straw-colour. Cilia paler. Posterior wings pale fuscous grey, 

 clothed with coarse scales. Marginal scales pale fuscous, with still 

 paler bases. Cilia whitish, or very pale straw-colour, shining. Ab- 

 domen shining, pale fuscous, or straw-colour ; the caudal tuft straw- 

 colour, sometimes inclining to ochreous. $ Exp. al. 10 lin. An- 

 terior wings bright pale ochreous, darkest at base, narrower and more 



