Gynandromorphous Agriades coridon. 259 



foimed, they are always wholly female and almost always 

 symmetrical. In the two specimens in which one cemenl 



gland was smaller than the other, in one it was smaller 

 on the gynandromorphous and in the other and more 

 marked example it was smaller on the normal purely 

 female side. 



It is difficult to explain why reduction in size takes 

 place on the side showing male characters in an insect 

 in which the male is considerably larger than the female. 

 Large size may be a unit character independent of that 

 responsible for the peculiar scales of the male; but. even 

 if this be so, it remains obscure why the parts which show 

 a mixture of secondary sexual characters should show an 

 actual deficiency of growth. All the other parts on the 

 gynandromorphous side, such as the antennae, legs, 

 abdominal rings and external genitalia, show a normal 

 growth. It is evident, however, that defective growth of 

 the wings is almost a constant feature of the Royston 

 gynandromorphs, and on the whole is most marked where 

 the male element is most manifest. The most notable 

 exception is the specimen (PI. LXXI1J. tig. 5) in the 

 possession of Mr. P. M. Bright. In this the male element, 

 judged by the abundance of blue scales, is s1 conger than in 

 any other specimen of this kind which I have seen. There 

 are, however, very few androconia ; large areas being 

 entirely destitute of them. The wings are equal on the 

 two sides and so it does not fall under ab. roystonensis, 

 though obviously it ought to do so. It is interesting to 

 compare this specimen with the next bluest specimen I 

 have seen, in which androconia and coarse hair scales are 

 very abundant on the fore-wing, which is correspondingly 

 small (PI. LXXIII, fig. 4). 



Halved or nearly halved gynandromorphs of A. coridon 

 (genetic and primary somatic hermaphrodites) are ex- 

 tremely rare, and only about half a dozen have been re- 

 corded. One from Dover, perfectly halved, is figured in 

 Barrett's "British Lepidoptera," vol. i, PI. xii. tig. le. 

 Another was taken by Mr. Quarrington in the Reigate 

 district on July 31st, 11)11. and has not been recorded 

 previously (PI. LXXIII, fig. ?>). The external genitalia are 

 partly male and partly female. In a specimen taken at 

 Purley by Mr. Kirknian, the abdomen and three wings are 

 apparently male, and one fore-wing and half the thorax are 

 female (Ent., xxv, p. 2, PI. i. fig. •'>). In these and similar 



