82 TORTRICINA. 



apex dark grey. Antennae fuscous. Thorax dull brown, darker 

 behind. Patagia dull brown at base, tips paler. Anterior wings 

 dull pale drab, with umber brown and golden brown markings ; at 

 the base is a large umber patch, streaky and paler inwardly, and 

 extending one-third along the dorsal margin; its posterior edge 

 sharply denned, directed obliquely outwards to the middle of the 

 wing, where it encounters a brown cloud, which suffuses the whole 

 of the costal portion of the wing. From the middle of the costa 

 proceeds an undefined, broad, oblique, brown fascia to the anal angle, 

 before attaining which, it is, in some specimens, slightly interrupted. 

 This fascia, in conjunction with the basal patch, encloses a pale tri- 

 gonate space on the dorsal margin, spotted and streaked transversely 

 with brown, especially on the margin itself. The costa is streaked 

 throughout, geminated in the apical portion. The apical spot is 

 distinct, and sometimes there is a drab-coloured streak beneath it, 

 which runs through the apical scales and the cilia. The ocelloid 

 patch is small, and not clearly defined ; it usually is in the form of 

 a pale space, enclosing two curved, slightly lustrous streaks, clouded 

 between with brown. Apical scales intense brown, with pale bases, 

 and sometimes tipped with grey. Cilia smoky black, speckled with 

 brown, becoming paler at the anal angle, and iron-grey beyond it ; 

 their bases grey. Posterior wings clothed with coarse rich brown 

 scales, deepest at the apex. Marginal scales fuscous, with straw- 

 coloured bases. Cilia dull pale fuscous. Abdomen dull fuscous, the 

 caudal tuft slightly paler. $ Exp. al. 6-6^ lin. Markings as in 

 the <J , but slightly more distinct. Posterior wings pale fuscous, 

 darkening towards the apex. 



Very nearly allied to P. tetraquetrana^ut smaller, and usually 

 darker in colour ; the anterior wings are narrower, and the patch 

 at the base more sharply angulated in the middle ; the spot beyond 

 the middle is less distinct) but in the same situation as in P. tetra- 

 quetrana. 



The imago appears in April and May, and again in August 

 and September, among Birches, but far from common. It 

 occurs around London, at the New Forest, New Brighton, and 

 the west of England, and in Scotland. 



According toM. Guenee,the pupa is to be found in a soft cocoon, 

 above the earth. On the dorsum it is rufous, beneath luteous, 

 with the anal termination quadrate, as in Diloba cceruleocephala. 

 He also describes the larva as of a greenish grey colour, with 

 the head testaceous : it feeds on the leaves of Betula Alba, 

 rolling them up strongly into a cylinder, by silken threads. 



