No. 34.] HEMIPTERA OF CONNECTICUT: APHIDIDAE. 305 



Apterous female with base of vi nearer two and one-half times 

 length of ii than three times length of ii (or if not then base of 

 vi not more than two times length of hind tarsus) 6 



5. Cornicle with distal half having strong imbrications extending to 



area of reticulation ptericolens 



Cornicle without strong imbrications leading to area of reticulations 



diervillae 



6. Ill with numerous sensoria not in a row 7 



III with sensoria confined approximately to single row 10 



7. Ill of apterous female with sensoria not much exceeding basal half 8 

 III of apterous female with sensoria extending over at least two- 

 thirds length g 



8. Cornicle with distal area of reticulation approximately one-sixth 



its length rosae 



Cornicle with distal area of reticulation exceeding one-fourth its 

 length impatiensicolens 



9. Cornicle with area of reticulation less than one-eighth its length 



albifrons 

 Cornicle with area of reticulation more than one-fifth its length . . 



ameianchiericolens 



10. Fore wing with Cu and A heavily shaded 11 



Fore wing with Cu and A not heavily shaded, though sometimes 



darker than other veins 12 



11. Vein A of fore wing conspicuously longer than cornicle . .venaefuscae 

 Vein A of fore wing shorter than cornicle coryli 



12. Developing on Magnoliaceae 13 



Not developing on Magnoliaceae 14 



13. Base of vi about five times length of tip* of v liriodendri 



14. Cornicle with nearer one-fourth than one-third its length reticulated 15 

 Cornicle with nearer one-third than one-fourth its length reticulated 



granarium 



15. Cornicle with hardly more than one-seventh its length reticulated 16 

 Cornicle with at least one-sixth its length reticulated 17 



16. Cornicle conspicuously longer than vein A of fore wing . . calif ornicum 

 Cornicle conspicuously shorter than A gaurae 



17. Cornicle not much shorter than either A or iii 18 



Cornicle distinctly shorter than either vein A of fore wing or 



antennal iii onagrae 



18. Second joint of first tarsus less than one-half base of vi .^ 19 



Second joint of first tarsus more than one-half base of vi 20 



19. Ill with approximately distal one-sixth clear of sensoria pseudocoryli 

 III with approximately distal one-half clear of sensoria lilii 



20. Cornicle pale to dusky 21 



Cornicle deep black pseudorosae 



ai. All tibiae with base about setae paler giving a mottled appearance 



asclepiadifolii 

 All tibiae with base about setae concolorous with adjacent area . . 



solanifolii 



22. Developing on rose 23 



Not developing on rose 24 



23. Ill of apterous female with one to few sensoria dirhodum 



III of apterous female with seventeen to twenty-five sensoria m a 



somewhat uneven row pseudodirhodum 



24. Ill with sensoria in fairly regular single row 27 



III with sensoria not confined to single row 25 



25. IV of alate female with sensoria (eight more or less) 26 



* Distal part including sensorium. 



