Explanation of Plate XXVI. 



Figs. 1, 2, 3. P. imrus in October before hibernation (1913) in 3rd 



instar. 

 „ 4, 5, 6. P. icarus in last stage in January 1914 (forced). 

 ,, 7, 8. ^. ther sites larvae in 3rd instar. 

 „ 9, 10. A. thersites larvae in 4th instar before hibernation. 

 „ 11. A. thersites larvae in 3rd instar after hibernation in 



3rd instar. 

 ,, 12. A. thersites larvae after hibernation recently moulted 



into 5th (last instar). 



