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 bipunctaia Linn. 
7 Larva 
8 Pupse 
9 Adult 
Woolly beech leaf aphid 
Phyllaphis fagi Linn. 
10 Infested beech leaf 
11 Nymph enlarged 
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 
