3953 Insects. 



exhausted ; and there are several conspicuous species which we have 

 not yet succeeded in breeding. For instance ; N. argentipedella (if a 

 birch-feeder, must make a larger mine than those I have yet found), 

 angulifasciella, argyropeza (in all probability on some species of pop- 

 lar), intimella (from Mr. Sircom's observations should.be expected on 

 sallow), Louisella, quinquella (most probably an oak feeder), and tri- 

 maculella (which should occur on the Lombardy poplar). 



Of those species that have been already bred, some may be at once 

 named specifically ; others appear to form parts in groups of closely 

 allied species, which, to discriminate accurately, require the careful 

 examination of a series of each individual composing the group : and 

 it is therefore hardly advisable rashly to give a name, while we are 

 uncertain what the distinguishing characters are. 



Apple. The species bred from the apple forms one of the Ignobi- 



lella group. 

 Bramble. This is the well-known large species, N. aurella. 

 Buckthorn. To this species, closely allied to N. Septerabrella, and 



not hitherto described, I have given the name of Catharticella. 

 Elm. Two larvae were distinguished, one yellow and the other green. 

 The imago of the green one is not closely allied to any previ- 

 ously known species ; from the gut-like appearance of its mine, 

 Mr. Douglas has proposed for it the name of N. viscerella. The 

 imago produced from the yellow larva is the N. centifoliella of 

 my Catalogue, but clearly not the continental centifoliella, which 

 is a rose feeder. From the tendency of the larva to mine at the 

 edge of the leaf, going even in and out all the serratures of the 

 leaf, I propose to call it marginicolella. 

 Geum urbanum. Closely allied to N. aurella, if, indeed, it be truly 



distinct. 

 Hawthorn. Two larvae only were distinguished, one green, the 

 other yellow ; it would however appear that there are two kinds 

 of the latter, as, from yellow larvae I obtained N. pygmaeella and 

 gratiosella. The green larvae produced a species allied to N. 

 ruficapitella. 

 Hornbeam. Two species of larvae mine in the leaves of this tree, 

 but they are not distinguishable by colour, only one is consider- 

 ably larger than the other. The imago of the large larva is one 

 of the Floslactella group ; that of the small larva belongs to the 

 Ignobilella group. 

 Hypericum perforatum. This is the no longer unique, but still 

 scarce, N. Septembrella. 



