VAIUATIOX. 59 



which the lar\a feeds. J/, semihirpiirella cuts a pocket in the under- 

 side of the leaf, M. purpurella on the edge of one of the lateral ribs. 

 The time which these species take to cut a pocket depends on the tem- 

 perature. In cold wQTiihtr piirpure/la exceeds 15 minutes, ^mimaculella 

 a little over 9 minutes, whilst in warm weather seinipurpurella only took 

 2^ minutes. Incurvaria miiscaleUa^ which cuts a pocket in the under- 

 side of a sloe leaf, Dr. Chapman records, only takes from 10 to 15 

 seconds. That part of the genus comprising calthella, seppella, etc., 

 appear to be without this apparatus, and if so will have to be separated 

 generically from those that have it. 



Lithocolletis betulce, Z., has been added to the British fauna by Mr. 

 A. F. Griiifith, and described in the E.M.M. I believe it would be 

 found to be common among birches in Scotland if searched for. It is 

 closely allied to corylifoliella, but not glossy. 



I understand that the late Professor Frey's collection has been 

 acquired by the British Museum authorities. 



Variation. 



Amphidasvs betularia var. doubledayaria. — This is occasionally 

 taken at Wisbech, together with dark forms of a few other species. If 

 the " wet " theory of melanism be true, we can hardly expect to get 

 many black vars. in the Fen-land — the driest district in England. — G. 

 Balding, Wisbech. 



Hybernia marginaria (progemmaria) var. fuscata. — The dark 

 forms of this species are common here, together with large numbers of 

 the type. — W. Mackmurdo, The Ferns, W anstead. 



I have taken Hyber?iia progemmaria at Chingford, Walthamstow, etc. 

 It is my opinion that this species is certainly getting much darker in 

 these districts, being suffused with black, and losing the light buff 

 colour. Specimens exhibited by Mr. Battley at the City of London 

 Entomological Society's meeting, and taken in North London, were 

 even darker than those I have taken. — J. A. Clark, London Fields. 

 April i^th, 1890. 



The dark form of Hyberriia progemmaria appears to emerge here a 

 little later than the ordmary type. It may have been an accidental 

 coincidence, but the last week this species was out I took four of this 

 form, whilst only one occurred, during the three preceding weeks. — G. A. 

 Harker, Huskisson Road, Liverpool. May 12th, 1890. 



[This variety seems gradually to be produced in dist: lets where it was 

 formerly quite unknown. It is common, I learn from Mr. Harker, at 

 Liverpool, and it is certainly becoming common in the north-east of the 

 London district. — Ed.] 



Argynnis aglala var. charlotta. — With the Argynnis ag/aia I 

 took last July at Borrodaile, I obtained a fine var. charlotta. — W. 

 Mackmurdo, Wanstead. 



Varlation in Zyg.^na lonicer^:. — Mr. Stanger Higgs {a?ite, p. 12) 



