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VIII. Gynandromorphous Agriades coridon, Poda; A. 

 coridon ab. roystonensis, Pickett. By E. A 

 Cockayne, D.M., F.R.C.P., F.E.S. 



[Read March 1st, 1916.] 



Plates LXV-LXXIII. 



Three forms of Agriades coridon occur, in which the 

 blue scaling differs in amount on the corresponding wings 

 on the two sides. In females, which have a good deal of 

 blue on the hind-wings, it is not very unusual to find the 

 blue spots larger on one side than on the other, or to find 

 one or more diffuse patches or well-defined spots on one 

 hind-wing unrepresented on the other. In the second of 

 these forms one finds one or even more than one streak 

 of brilliant blue scales. Such streaks are generally con- 

 fined to one wing, and are seen more often on the fore- 

 wing than on the hind-wing. The specimen figured is 

 exceptional in having the fore-wing and the hind-wing 

 on opposite sides affected in this way. Both these forms 

 are referable to ab. inaequalis, Tntt, but they are prob- 

 ably due to different causes and for this reason deserve 

 distinctive names. I propose to restrict the name ab. 

 inaequalis to the second, or streaked form (PI. LXX1I, 

 figs. 1 and 2), and to name the first or unequally spotted 

 form ab. impar (nov. ab.), (PL LXXIII, figs. 1 and 2). The 

 majority of specimens described as gynandromorphous in 

 the lists of Oscar Schultz are examples of ab. inaequalis in 

 this restricted sense, but it is doubtful if there is really a 

 male element in them or in ab. impar. Though I have 

 examined a number of well-marked specimens of both 

 forms I have never seen androconia in either, except in 

 a specimen which shows gynandromorphism on the right 

 side and a blue spot without androconia on the left. 

 This specimen affords strong evidence of the different 

 nature of the asymmetry of blue scaling in ab. impar and 

 ab. roystonensis. 



In the third form, with very few exceptions there is 

 inequality in the size of the wings, and the blue 

 are accompanied by androconia and coar e hair scales. In 

 my article on these specimens with asymmetry of size and 



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



