EXPLANATION OF PLATES 

 PLATE 1 



Fig. 1. Myzocallis asclepiadis (Fitch), tarsus and claw. 



Fig. 2. Aphis senecio Swain, tarsus and claw. 



Fig. 3. Essigella calif ornica (Essig), sixth antennal segment and spur. 



Fig. 4. Aphis senecio Swain, sixth antennal segment and spur. 



Fig. 5. Essigella californica (Essig), cauda and anal plate (lateral view). 



Fig. 6. Aphis senecio Swain, cauda and anal plate (lateral view). 



Fig. 7. Eucallipterus tiliae (Linn.), cauda and anal plate. 



Fig. 8. Thomasia populicola (Thos.), cauda and anal plate. 



Fig. 9. Phyllaphis fagi (Linn.), third antennal segment. 



Fig. 10. Phyllaphis fagi (Linn.), sixth antennal segment. 



Fig. 11. Phyllaphis fagi (Linn.), cauad and anal plate. 



Fig. 12. Phyllaphis fagi (Linn.), front of head and antennal tubercles. 



Fig. 13. Phyllaphis coweni (Ckll.), Antenna. 



Fig. 14. Phyllaphis quercicola Baker, third antennal segment. 



Fig. 15. Phyllaphis quercicola Baker, fourth antennal segment. 



Fig. 16. Phyllaphis quercicola Baker, fifth antennal segment. 



Fig. 17. Phyllaphis quercicola Baker, sixth antennal segment. 



Fig. 18. Phyllaphis quercicola Baker, forewing. 



Fig. 19. Phyllaphis quercicola Baker, cauda and anal plate. 



Fig. 20. Phyllaphis querci, tarsal claw. 



Fig. 21. Drepanosiphum platanoides (Schr.), antennal tubercles. 



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