Gynandromorphous Agriades coridon. 261 



blue scales may show the mixed characters, or only the 

 curious deficiency of growth which the mixing seems almost 

 uniformly to produce. And since the deficiency of growth 

 is greatest where the female element predominates least 

 strongly, it is possible that when the balance is very even 

 the chromosomal abnormality may be present without 

 any external evidence whatever. Such an individual 

 might appear to be a normal female coridon. 



That a gynandromorphous constitution may be masked 

 in this way is suggested by some of the families of Lymantria 

 (I is par x L. dispar var. japonica bred by Goldschmidt. In 

 several of these families the percentages of males, females 

 and gynandromorphs was such that he was driven to the 

 view that some of the specimens which appeared externally 

 to be males were really gynandromorphs. 



We are thus met by the paradox, that in Lymantria and 

 Agriades gynandromorphs exist with the external marks of 

 their gynandromorphism entirely masked. 



I venture to hope that by putting forward these very 

 speculative suggestions I shall stimulate some more com- 

 petent than myself to undertake the work necessary in 

 order to prove or disprove them. Field observations may 

 fill in some of the gaps in our knowledge, but breeding 

 experiments and cytological investigations are needed to 

 solve the fascinating problem presented by the Royston 

 gynandromorphs. 



In conclusion, I offer my thanks to many Entomologists 

 for helping me, and to Messrs. Jackson, Leeds, Pickett 

 and H. B. Williams for permission to photograph and 

 figure their specimens. 



Bibliography. 



Chapman, T. A. Trans, of the City of London Ent. and 



Nat, Hist. Soc, 1912 and 1913, p. 67. 

 Cockayne, E. A. Ent. Record, 1914, vol. xxvi. p. 22] ; 



Journal of Genetics, 1915, vol. v. No. 2, pp. 75-128. 

 Goldschmidt, R,, and Poppelbaum, H. Zeitschr. f. 



Indukt. Abstamm, 1914, Bd. xi. 

 Pickett, C. P. Ent. Record, 1911. vol. xxvi. pp. 59 



and 275; ibid., 1910. vol. xxviii. p. 7; ibid., 1916, 



vol. xxviii. p. 59. 

 Tutt, J. W. "British Butterflies," 18%. ]>. 167; ibid., 



vol. iv, pp. 6 and 30. 

 Williams, H. B. Ent. Record. L915, vol. xxvii, p. 85. 



TRANS. ENT. SOC. LOND. 1916. — PART II. (DEC.) S 



