ON THE "lITA" group OF THE GELECHIIDiE. 29 



the following species : — marmorea, H\v., junctella, Dougl., 

 vicinella, Dougl., leucomelanella, Sta., maculiferella, Sta., 

 knaggsiella, Sta., and semidecandriella (n. s.) ? I know marmorea 

 well. I have taken 'maculiferella among hawthorn in Westcombe 

 Park (close to my house) ; and on the sand-hills at Deal I have 

 taken a large number of specimens belonging to this group, 

 forming in their extreme variations four very good types, but 

 connected by almost every possible intermediate form. The 

 following are the principal types : — 



No. 1 is a very pale, greyish white form, with a very dark and 

 distinct black line crossing the anterior wings obliquely from the 

 costa, commencing at about one-fourth from the base, and extending 

 not quite across the wing to the inner margin, which, if continued, it 

 would meet at one-third from the base. Near the hind margin is a 

 very pale slightly curved line, and between this and the bind margin 

 the ground colour is rather darker grey than the rest of the wing. It 

 has also a conspicuous black spot on the disk of the wing, and one — 

 in two or three specimens — at the apex. 



No. 2 is exactly like No. 1 in ground colour, but is without the 

 black oblique line (which is reduced to a second dot in the centre of 

 the wing). The only recognisable markings are the pale curved line 

 and the two dots on the disk. 



No. 3 is of a much darker ground colour than No. 1, and closely 

 resembles macidiferella, but seems to have a finer, darker, and clearer 

 oblique streak, and the line parallel to the hind margin seems a little 

 more curved than in that species. It is also much clouded, with dark 

 grey each side of the pale line. This form Mr. Threlfali writes me he 

 has bred, and that it has been named semidecamlrieUa. 



No. 4, an almost unicolorous, blackish (in one specimen quite 

 black) form, with the oblique streak and dot on disk almost lost in the 

 ground colour, the pale line hardly perceptible, and slightly paler on 

 the inner margin. 



Between the very pale and black forms I have almost every 

 intermediate grade. I say almost, because there are none 

 directly intermediate betAveen 3 and 4 ; and my own series of 

 some eighty specimens I have divided into seven groups, as 

 follows : — 



No. 1. — As described above, ^= junctella, Sta. Man. 

 ,, la. — Intermediate between 1 and 2. This form Mr. 

 Coverdale named for me as knaggsiella. 



