256 Dr. E. A. Cockayne on 



In addition to the specimens showing male characters 

 and reduced size on one side only, there are a few examples 

 known which show them on both sides. Some are figured 

 here, others in the Journal of Genetics. All the forms 

 known so far can be classified in the following way : — 



I. Unilateral or halved Gynandromorphism. 



(a) Both wings reduced, blue scales, coarse blue hair 

 scales and androconia present. It is not very unusual to 

 find no hair scales and no androconia on the hind-wing. 



(b) Fore-wing or hind-wing alone showing the abnormal 

 scales ; the other wing usually reduced, but sometimes 

 normal in size. 



(c) Both wings reduced, androconia absent. Only one 

 or two blue scales present, and either none or one or two 

 coarse hair scales. 



(d) Wings reduced; no abnormal scales present. 



II. Bilateral Gynandromorjihism. 



(a) All four wings affected, but generally unequally 

 (Journal of Genetics, PI. xxii, figs. 8 and 9). Another 

 specimen similar to fig. 8 is in Mr. P. M. Bright's collection. 



(6) Three wings affected (PI. LXVI, fig. 1). This is in 

 Mr. Pickett's collection taken at Royston 1915, and in 

 addition to blue scales it has coarse blue hair scales on 

 both fore-wings. Androconia are numerous on the left 

 hind-wing, uncommon on the right fore-wing and very 

 scanty on the right hind-wing. 



(c) Two wings affected (PL LXVI, fig. 2). Taken by 

 Mr. Leeds at Royston, 1915. Blue scales not very numer- 

 ous. Only one or two coarse hair scales, and only one 

 androconial scale seen on each fore-wing. No inequality 

 in size. 



(d) Reduction of size on one side ; blue scales, coarse 

 hair scales and androconia on the other (Journal of 

 Genetics, PI. xxii, fig. 10). 



III. Crossed Gynandromorphism. 



Specimen taken by Mr. Pickett at Royston, 1915. Re- 

 duction in size with presence of a number of blue scales, 

 coarse hair scales and androconia of left fore-wing. Re- 

 duction of size with presence of numerous blue scales and 

 androconia of right hind-wing (PL LXVII, fig. 1). 



