Insects. 8359 



extends almost fasciaform to the costa. The apex of the wing is dark 

 violet-blue. The disk of the wing is shining and rather smooth, but 

 not so glossy as in N. Tiliae. Besides the anterior wings vary not 

 inconsiderably, according as the light ground-colour or the dark scales 

 predominate, but the pale spot at the base is always distinct, and 

 strongly contrasts with the dark place beyond, as also with the black 

 thorax. The base of the cilia dark violet-blue from the apex of the 

 wing to the anal angle ; their tips are dark gray; at the anal angle and 

 inner margin the cilia are entirely pale gray ; no divisional line occurs. 

 The posterior wings without peculiarity are pale gray, with the cilia 

 little darker. 



The larva is green, and feeds in oak leaves in July, and again in 

 September and October. The mine forms a long track, rather tortuous, 

 of nearly uniform breadth, entirely filled up with the dark green excre- 

 ment. 



This species has been noticed at Brunswick and Hanover, and Frey 

 has also found the larva at Zurich. 



Group II. 

 7. N. Nylandriella, H.-S. 

 Capillis $ fuscis, <j> ochraceis, antennarum conchula alba ; alis 



anterioribus nitidis, lithargyreis. Exp. al. lj lin. 

 Herrich-Schcsffer, v. 359, 1133, fig. 927. 



The frontal tuft of the male is brown, that of the female pale ochreous- 

 yellow ; the antennae are short whitish gray ; the eye-caps silvery 

 white. I cannot distinctly perceive the cervical tuft, yet it appears in 

 the male to be more whitish, in the female pale yellow ; the abdomen 

 black-gray ; the legs silvery gray. The anterior wings are very smooth, 

 as though polished, extremely shining ; their colour is pale silvery 

 gray, with very pale and faint yellowish tinge ; the apex of the wing 

 is scarcely darker, with a very faint pale violet gloss; the cilia are 

 whitish gray, rather darker towards their bases. The posterior wings 

 and cilia are pale gray. 



I took this insect at Brunswick, in May, very sparingly on beech- 

 trunks, and I still possess a pair. It agrees in size and colour com- 

 pletely with Herri ch-Schse tier's figure, and is easily distinguished 

 from all the other species by its small size and colour. 



Group III. 

 I have removed from this group Frey's N. geneofasciella, and on 

 the other hand have placed here N. regiella and N. latifasciella. 



