44 The Irish Naturalist. April, 



5. With the costal margin bright yellow; this form is 



fairly common in the spring emergence and 

 decidedly so in the summer brood. I have bred 

 this form from larvae fed on water-cress. 



6. All spots small and pale and with the costal margin 



and fringes on all wings bright yellow, a very 

 pretty form. I have only one specimen, which 

 was bred from a larva fed on water-cress. 



7. Ground colour of all wings creamy and all markings 



small and very pale grey ; scarce but taken 

 in both emergences. 

 7 A. Ground colour yellowish and markings grey, except 

 the two spots on upper wings, which are very 

 black. 



8. Ground colour creamy yellow and all markings and 



nervules very dark ; scarce and appears most 

 often in the summer emergence. 



9. Ground dirt}^ yellow or buff colour, apical blotch 



and spots grey and the nervules and base of 

 forewings heavily shaded with smoky grey ; this 

 is the nearest approach to the alpine variety 

 bryoiiiae that I have come across ; and I have 

 only taken one specimen, which I captured in 

 the month of May. 

 10.- All the usual markings very large and black and 

 the extremities of all nervules with broad black 

 streaks especially on the fore wings ; fairly 

 common in the second emergence. 



11. With two spots on the upperside of each hind wing 



common in both emergences. 



12. With three distinct spots on the upperside of each 



hind wing one on the costal margin, one in the 

 middle area and a third near the anal angle ; 

 scarce and generally in the summer emergence. 



13. Centre area of all wings on the upper side creamy 



yellow, the rest of the wings white ; one only 

 taken, in the summer brood of 1921'. 



14. The underside of hind wings pale yellow and the 



nervules much shaded with green ; very common. 



