250 Dr. E. A. Cockayne on Agriades coridon. 



densely packed blue scales, coarse hair scales and androconia on 

 left fore-wing. No blue scales on left hind-wing. Ovaries and 

 cement glands symmetrical and normal. Other organs present 

 and normal. Caput empty. External genitalia symmetrical and 

 like those of normal female (PI. LXV, fig. 1 ). 



No. 17. Fore-wings, right 16*5 mm., left 17'5 mm. Facies alike 

 on both sides, very dark colour. Very small patch of blue scales, 

 coarse hair scales and androconia along posterior border of right 

 fore-wing. The patch is only just visible to the naked eye. No 

 blue scales on right hind-wing, but obvious reduction in total area 

 and in size of lunules. Ovaries and cement glands symmetrical 

 and normal. Other organs present and normal. Caput contains 

 granular material. External genitalia symmetrical and like those 

 of normal female (PI. LXVIII, fig. 2). 



No. 18. Fore-wings, right 16 - 25 mm., left 14 mm. Left hind- 

 wing smaller than right. Upperside facies the same on both 

 sides. Underside, right typical, left ab. parisiensis. Left antenna 

 shorter than right. Left fore-wing has one blue scale near apex 

 and a blue scale and coarse blue hair scale near posterior border. 

 No androconia seen. Ovaries and cement glands symmetrical 

 and normal. Other organs present and normal. Caput empty. 

 External genitalia symmetrical and normal (PL LXXI, fig. 2). 



No. 19. Both wings smaller on the left side, right fore-wing 

 17 mm., left 16 mm. General facies alike on both sides. One 

 blue scale external to discal spot on small fore-wing. Lunules 

 slightly reduced on small hind-wing. Internal and external genitalia 

 like those of normal female. 



No. 20. Both wings smaller on the right. Internal and external 

 genitalia like those of normal female. 



No. 21. Fore-wings, right 17'25 mm., left 16*5 mm. Very dark 

 specimen. Marked reduction of size of lunules on the small left 

 hind-wing. Careful microscopic search revealed no blue scales and 

 no androconia. Ovaries and cement glands equal in size and large. 

 Other organs present and normal. Caput contained granular 

 material. External genitalia symmetrical and like those of normal 

 female (PI. LXIX, fig. 2). 



Ill addition to above complete dissections partial ex- 

 aminations were made of sixteen gynandromorphs, taken 

 in August and September 1915 at Royston by Mr. L. W. 

 Newman, and set and dried by him in the usual way. 

 They were treated with potash, and though minor ab- 

 normalities may have been overlooked an almost perfect 

 dissection was carried out on some of them. In seven, 



