Insects. 



8307 



broader fascia before it, and the space beyond it violet-black ; the 

 middle tibia) are also whitish. In N. ignobilella the anterior wings are 

 narrower and longer, paler, the fascia stands further beyond the middle, 

 and is less golden ; the apex is violet. With the other species of this 

 group any confusion is not so easy, since in them the apex of the ante- 

 rior wings differs less in colour and glossiness from the basal half. 



Stainton's statements do not agree with the two specimens which I 

 possess, in that he says " fascia extremely brilliant," and calls the 

 colour of the tip of the wing " dark purple, almost black." According 

 to the account of the larva I can have no doubt but that my species is 

 identical with his. 



The pale amber-yellow larva feeds at the beginning of July and end 

 of September on the leaves of Alnus glutinosa ; the mine is long and 

 narrow, tortuous, entirely filled up with dark excrement. 



Found in England, also near Brunswick and near Zurich. 



15. N. DULCELLA. 



Capillis ferrugineis, antennarum conchula luteo-alba; alis anterior- 

 ibus dimidio basali olivaceo-aeneis, subnitidis, postice atro-pur- 

 pureis, fascia post medium recta, argentea nitidissima, ciliis 

 apice griseis. Exp. al. 2 J lin. 



Very like N. continuella. I can only find a difference in the paler 

 colour of the anterior wings, and in the narrower dark fascia which 

 precedes the silvery fascia being more obsolete towards the base. The 

 anterior wings are pale olive-bronze from the base, rather glossy ; they 

 become gradually darker towards the silvery fascia, and before it 

 become for an undecided extent dark brown, with faint purple-violet 

 gloss ; this is also the colour of the space between the fascia and the 

 apex. The protruding scales in the cilia are dark violet ; they lie in 

 two rather regular rows, of which the outer one is the paler ; the tips 

 of the cilia are gray. The posterior wings are rather paler than in N. 

 continuella. 



I have a pair bred from mines in strawberry leaves, which I could 

 not distinguish from the mines of N. fragariella. The male I sent to 

 Frey, who refers it to N. fragariella, remarking that the two sexes of 

 that species differ considerably. I have myself received N. fragariella 

 from Heyden. It is the species already described, and of which I and 

 Buchheister have bred both sexes of quite similar specimens ; likewise 

 of N. dulcella I have bred both sexes, which also agreed precisely, 

 only that the male, as far as I remember, had more the colour of N. 



