8374 Insects. 



bright. The fascia is placed rather posteriorly, vertical or only slightly 

 oblique; it is narrow, sometimes very narrow, throughout of uniform 

 width, not very sharply defined ; its colour is whitish, with a faint 

 yellowish silvery gloss ; in all specimens the tip of the wing is dark 

 violet-blue or black-blue, likewise the bases of the cilia, which then 

 become dark gray, with their tips paler. The posterior wings and their 

 cilia are pale blackish gray. 



The wax-yellow larva feeds in July, and again at the end of Sep- 

 tember and beginning of October, in the leaves of Alnus glutinosa; 

 the mine is serpentine, with a loose excremental track in the middle ; 

 the cocoon is of a broad oval form, rather arched, with Hat margins ; 

 the colour is rusty brown. 



In England, and at Brunswick and Wolfenbuttel. 



Group VIII. 



22. N. LUTEELLA, Sit. 



Capillis luteis aut fuscis, antennis brevioribus, conchula albida ; alis 

 anterioribus obscure olivaceis, apice violaceo-tinctis, fascia post 

 medium luteo-albida, parum nitida, antice evanescente, ciliis 

 apice pallide griseis. Exp. al. If — 2 lin. 



Stainton, Ann. 1857; Man. ii. 434. 



This species may be known by the ill-defined yellowish fascia, 

 which is less distinct towards the costa, or at least attenuated there. 

 The frontal tuft is generally pale ochreous or luteous, often mixed 

 with gray, more rarely entirely black-brown ; the cervical tuft and the 

 large eye-caps whitish ; the antennae of the male have half the length 

 of the anterior wings; those of the female are rather shorter, they are 

 blackish gray; the abdomen and legs are of the same colour, only the 

 tarsi and middle tibiae are whitish. The anterior wings are rather 

 short; their ground colour is similar to that of N. turicella, but from 

 the coarser scaling they appear uniformly darker up to the pale fascia, 

 which has no dark border on its basal side ; beyond the fascia the 

 wings are dark brown, with more or less of violet, rarely with a bright 

 violet-blue gloss. The fascia is placed rather beyond the middle of 

 the wing; it is not sharply defined, broad on the inner margin, it be- 

 comes attenuated and often obsolete towards the costa; its colour is 

 whitish, with a dash of olive-yellow ; it is rather more shining than 

 the adjoining surface, but the glossiness is ill defined and varies 

 according to the light; it varies in breadth and distinctness, so that 

 sometimes it only appears as a pale, rather more shining part of the 



