1922. Langham — Forms of Pieris napi in Co. Fermanagh. 43 



1. The apical blotch small and no spots on the fore 



or hind wings ; this is not very common here 

 and appears usually in the first emergence. 



2. Apical blotch larger and with one small spot on 



each fore and hind wing ; this is the commonest 

 form of the male and is usual in both spring and 

 summer emergences. 



3. Apical blotch large and black and a large black 



spot on all the wings and another spot near the 

 inner margin of the fore wings ; appears chiefly 

 in the summer emergence and is usually common. 



4. Apical blotch large and spots all very black and the 



ends of the nervules much blackened and forming 

 radiated stripes at all the outer margins ; 

 decidedly scarce. 



5. Upperside of all wings decidedly pale yellow ; not 



uncommon. 



6. Underside of hind wings pale yellow ; very common. 



7. Underside of hind wings bright primrose ; very 



common. 



In the female forms there is a much greater range. 



1. Apical blotch small and pale, with the two spots and 



dorsal marginal bar on fore wings and the two 

 spots on the hind wings, small and not very 

 black, the nervules not heavily shaded ; generally 

 common. 



2. All the markings and spots large and very black, 



and the nervules heavily shaded ; common in 

 both emergences. 



3. All the markings and spots very grey and the 



nervules broadly shaded and the base of the 

 fore wings especially very grey — giving a rather 

 washed out appearance ; most common in the 

 spring emergence. 



4. Apical blotch dark, and with a distinct spot within 



its area forming with the other two spots and 

 the dorsal marginal bar a continuous dark band 

 or bar. This I have only taken on three 

 occasions all in the summer emergence. 



