dissimilar even in kindred insects, that they cannot be de- 

 pended upon in the combination of species, it becomes ex- 

 tremely difficult to characterize them. As we believe that 

 most valuable characters might be obtained from the attitudes 

 and figures of the moths when at rest, from the disposition of 

 their wings, abdomens, antennae and legs, especially amongst 

 the Tortricidae andTineidse, we would recommend an attention 

 to this subject. It may not be thought irrelevant to observe, 

 that we believe from experience, that in all the other orders, 

 the best sources oi generic distinction are the trophi, antennae, 

 and the nervures of the wings ; that species ought to be di- 

 stinguished by form, sculpture, and disposition of colour, which 

 latter character however, as well as size in most orders, is 

 subject to great variations, and is the criterion of sex or varie- 

 ties : this ought strongly to be impressed upon the mind of 

 the student, because the ends of science will be better answered 

 by generalizing than by dividing where it is not absolutely 

 necessary. 



Of the genus described there are at present but two species, 

 which may be distinguished from the rest of the family by 

 their pectinated antennae. 



1. A. pectinana Hilb. pi. \^.f. 108. In ascending Craig- 

 challoch, near Killin, the 21st July 1825, I took a single 

 specimen of this moth amongst the heath : about the same time 

 Mr. Stone (who obligingly gave me specimens) received several 

 from Birmingham ; and amongst some valuable insects cap- 

 tured in Scotland, and communicated by Charles Lyell, Esq., 

 was a specimen taken the beginning of last September in the 

 neighbourhood of Kinnordy. 



2. A. Walkerana 'Nob. Two specimens of this pretty moth 

 which I have the pleasure of dedicating to the captor, were 

 taken last summer near Lanark by Henry Walker, Esq., and 

 transmitted to his brothers at Southgate, to whose friendship 

 and liberality I am indebted for this and many other rarities. 



All the specimens of this genus hitherto discovered have 

 pectinated antennae, and appear to be males. 



The plant is Cerastium latifolium (Broad-leaved rough 

 Chickweed), which I met with on the mountains of Scotland 

 and Westmoreland. 



