APHIDS OR PLANT LICE 



Painted maple aphid 



Drepanosiphum acerifolii Thos. 



1 Infested leaves of silver maple 



2 Adult winged specimen enlarged 



3 Nearly full grown nymph enlarged 



4 Younger nymph enlarged 



Chaitophorus ? aceris Linn. 



5 Infested leaves of Norway maple 



6 Wingless female enlarged 



Two-spotted lady beetle 



Adalia bipunctata Linn. 



7 Larva 



8 Pupa 



9 Adult 



10 Infested beech leaf 



11 Nymph enlarged 



Woolly beech leaf aphid 



Phyttaphis fagi Linn. 



Elm leaf aphid 



Callipterus ulmifolii Mon. 



12 Infested elm leaf 



13 Nymph enlarged 



14 Winged female enlarged 



Transverse poplar stem gall 



Pemphigus populi-transversus Riley 



15 Galls 



16 Section of one showing plant lice within 



Periodical cicada 

 Tibicen septendecim Linn. 



17 Side view of adult 



18 Twig showing oviposition scars 



