Aphids or plant lice 

 Painted maple aphid, D r c p a n o s i p h u m a c e r i f o li i Thos. 



1 Infested leaves of silver maple 



2 Adult winged specimen very much enlarged 



3 Nearly full grown nymph very much enlarged 



4 Younger nymph very much enlarged 



Chaitophorus ? aceris Linn. 



5 Infested leaves of Norway maple 



6 Wingless female very much enlarged 



Two-spotted lady beetle, Adalia bi punctata Linn. 



7 Larva 



8 Pupae 



9 Adult 



Woolly beech leaf aphid, P h y 1 1 a p h i s f a g i Linn. 



10 Infested beech leaf 



1 1 Nymph much enlarged 



Elm leaf aphid, Callipterus ulmifolii Mon. 



12 Infested elm leaf 



13 Nymph very much enlarged 



14 Winged female very much enlarged 



Transverse poplar stem gall. Pemphigus populi-transversus Riley 



1 5 Galls 



16 Section of one showing plant lice within 



Periodical cicada, Tibicen septendecim Linn. 

 I 7 Side view of adult 

 18 Twig showing oviposition scars 



a35S 



