226 Dr. E, A. Cockayne on 



the penis protruded, but as the abdomen is female it was 

 probably the ovipositor (111. Zeitschr. f. Ent., 1902, vii, 

 p. 211). 



Oberthiir has figured six with large blue patches, or 

 with the whole of the wings blue on the right side, and 

 with a reduction in size of the wings on the same side. 

 The borders of these wings are very dark and the fringes 

 white. One is from Plechatel, and five from Monterfil 

 both in lUe-et-Vilaine, France (Lep. Comp., 1920, xvii, 

 PI. DX). 



Specimens from all these localities agree in having blue 

 scales associated with a reduction in the size of the wing, 

 in most cases confined to the wings of one side. In both 

 Dover and Surrey specimens androconia are present 

 amongst the blue scales. Apart from these two species 

 the same form of intersexuality is found in Agriades tlietis 

 {heJlargiis). 



Oberthiir figures two, which are very blue and much 

 smaller on the right side than on the left. One is from 

 Digne, 1907, one from Dompierre-sur-Mer, 1908 (Lep. 

 Comp., 1909, iii, PL XIX, figs. 69, 70). He has figured 

 seven more, three with large blue patches on the wings of 

 both sides, four with the blue confined to one side. One 

 is from Auzay, Vendee, and six from Dompierre-sur-Mer, 

 Charente-Inferieure (Lep. Comp,, 1920, xvii, PI. DX). 



In these three species intersexes are found year after 

 year in certain restricted localities, but I think it will 

 be discovered that they have a wider range than the 

 present records indicate. 



Association with excess of Females and ab. 



inaequalis. 



In the case of A. coridon there is no doubt that where 

 ab. foystonensis is fairly common, as at Royston and near 

 Tring, the number of females greatly exceeds that of the 

 males. 



At Alton Barnes, where, so far as I know, only two 

 ab. roystonensis have been taken, the sexes appear to be 

 equal in numbers, but a small excess of females would 

 easily pass unnoticed. Castle Russell states that in his 

 Surrey locality for intersexes of argus the proportion of 

 females to males was at least 100 to 1. 



In the colony of argus, which I visited, females did 

 outnumber males, but not to the same extent as in coridon 



