THE ENTOMOLOGIST 



Vol. XXVIIL] MARCH, 189 5. [No. 382. 



EDITORIAL. 



We are very pleased to inform our readers that Mr. F. W. 

 Feohawk, who has done much original work in investigating and 

 writing on the early stages of British Ehopalocera, has been 

 good enough to join the 'Entomologist' Reference Committee. 



ON THE CAUSES OF VARIATION AND ABERRATION IN 

 THE IMAGO STAGE OF BUTTERFLIES, WITH SUG- 

 GESTIONS ON THE ESTABLISHMENT OF NEW 

 SPECIES. 



By Dr. M, Standfuss, Lecturer in both Academies at Zurich. Trans- 

 lated by F. A. DixEY, M.A., M.D., Fellow of Wadham College, 

 Oxford. 



[Introductory Note by F. Merrifield, F.E.S. 



In October of last year Dr. Standfuss kindly sent me a print 

 of a paper of his containing an account of some extremely 

 interesting results obtained by him from the exposure of Lepi- 

 doptera in different stages, and especially in the pupal stage, to 

 extreme temperature. Dr. F. A. Dixey has made a careful 

 translation of it, and this, it having been revised and corrected 

 by the author, with the assistance of his friend Dr. Friedrich Eis, 

 of Eheinau, Ct. Ziirich, I have much pleasure in submitting for 

 publication in the ' Entomologist.' By those who have read the 

 papers published by me in the 'Transactions' of the Entomo- 

 logical Society of London for the last few years, it will be recog- 

 nised that the experiments have in many cases been performed 

 by Dr. Standfuss on the same species as those upon which mine 

 have been tried. 



ENTOM. — MARCH, 1895. H 



