244 Dr. E. A. Cockayne on 



blue scaling, published in the " Entomologists' Record," 

 1914, I stated that they also fell under Tutt's ab. inae- 

 qualis. Mr. Pickett has written recently at some length 

 to prove that this is not so, and has named the form ab. 

 roystonensis, extending it to include specimens with 

 inequality in the size of the corresponding wings, but 

 without asymmetry of blue scaling. He says that Tutt 

 had never seen a specimen of ab. roystonensis, but a refer- 

 ence to " British Butterflies," vol. iv, shows that this is 

 not strictly accurate. On p. 6 of this work Tutt describes 

 a specimen taken by Dr. Hodgson in 1888 near Brighton 

 as a teratological example (66), and refers both to the 

 extra blue scales and to the smaller size of the blue-scaled 

 wings. On p. 30, where he describes ab. inaequalis, he 

 specially refers to it as an example of the aberration. 

 Fortunately I have examined it microscopically, and 

 have seen androconia and coarse hair scales on the 

 smaller right fore-wing and androconia on the smaller 

 hind-wing. Like the Royston specimens it is undoubtedly 

 gy nandromorphous . 



In the "Entomologists' Record," 1914, 1 gave descriptions 

 of six complete dissections of Royston gynandromorphs, 

 and in the Journal of Genetics, 1915, I described a seventh. 

 On this rather meagre material I ventured to make some 

 generalisations, for which I hoped to obtain further sup- 

 port at a later date. This I have been enabled to do by 

 fresh material obtained in 1915 by my own efforts and 

 through the kindness of my friends. 



In this paper I propose to discuss these peculiar 

 gynandromorphs, including all specimens coming under 

 Pickett's ab. roystonensis, with a complete account of 

 my new dissections, dealing with them under the following 

 headings. 



1. Geographical range. 



2. Family and hereditary character. 



3. Anatomy of internal and external genitalia. 



4. Psychology. 



5. External appearance. 



6. Theoretical discussion. 



Geographical Range. 



The vast majority have been taken at Royston on the 

 borders of Hertfordshire and Cambridgeshire, where they 



