B. Head not ferruginous, 

 a. Head cinereous. 



6. Subpurpurella, Haw. Anterior wings greenish golden, with a faint paler spot 



towards the anal angle. 

 Common, on oaks, in May. 



7. Semipurpurella, Steph. Anterior wings purple, irrorated with pile goWen ; an- 



tennae more than half the length of the anterior wings. 

 Common, on birches, in March and April. 



8. Sparmannella, Fabr. Anterior wings golden, with numerous transverse purple 



fasciae. 



Scarce, on birches, in May. 



/3. Head dark fuscous ; antennae less than half the length of the anterior wings. 



9. Purpurella, Haw. Anterior wings golden, with numerous irregular purple fasciae, 



and the veins purple. 



Common, on birches, in February and March. 

 10. Unimaculella, Zetterstedt. Anterior wings golden purple, with a conspicuous 

 whitish spot at the anal angle. 



Scarce, in March and April. 



The difficulties in the genus commence with semipurpurella, which in my Cata- 

 logue I have lumped together with purpurella and unimaculella as one species: these 

 are, however, truly distinct, and with fine specimens they are easily separated, though 

 in the ordinary run of specimens found in collections it is no easy matter to say to 

 which they should be referred. One main reason for our specimens being so poor is 

 that we do not collect them soon enough : they should be sought for in March ; by 

 delaying to collect them till April the specimens become wasted. I have no doubt 

 many might be met with in February in forward seasons. Haworth distinctly states 

 that Mr. Hatchett took two specimens of purpurella, in copula, in February. 



A conversation followed upon the notes which had appeared in the ' Gardener's 

 Chronicle,' on the danger to be apprehended by horticulturists from the attacks on 

 pears by the larvae of Ditula angustiorana, which in some instances referred to were 

 reported to have done some damage to this fruit. Several members concurred in 

 saying that there was but little ground for this opinion, as, except in the instances 

 quoted, this insect had not been observed to have attacked fruit trees, and in fact it 

 was seldom seen in gardens, although its larvae were polyphagous, but that the perfect 

 insect was found in the greatest abundance in firs and yews, often far from gardens. 

 Torlvix lasvigana, on the other hand, was known to be very destructive to fruit trees, 

 both foliage and young fruit, and it was supposed some of the ravages attributed to 

 D. angustiorana may have been the work of this species. 



