Aphid Food Plant Catalogue. 217 



11. Vein A of fore wing conspicuously longer than 



cornicle venaef uscae Davis 



Vein A of fore wing shorter than cornicle coryli 



12. Developing on Magnoliaceae 13 



Not developing on Magnoliaceae 14 



13. Base of VI about 5 times length of tip* of V. . .liriodendri 



14. Cornicle with nearer Y^ than % its length retic- 



ulated granarium 



Cornicle with nearer %. than ^ its length retic- 

 ulated IS 



15. Cornicle with hardly more than y^- its length 



reticulated 16 



Cornicle with at least ^ its length reticu- 

 lated 17 



16. Cornicle conspicuously longer than vein A of 



fore wing calif ornicuni 



Cornicle conspicuously shorter than A gaurae 



17. Cornicle distinctly shorter than either vein A 



of fore wing or antennal III onagrae 



Cornicle not much shorter than either A or III.. 18 



18. Second joint of 1st tarsus less than ^ base 



of VI 19 



Second joint of 1st tarsus more than ^ base 

 of VI 20 



19. Ill with approximately distal Ye clear of sen- 



soria pseudocoryli 



III with approximately distal Y2 clear of sen- 

 soria lilii 



20. Cornicle deep black pseudorosae 



Cornicle pale to dusky 21 



21. All tibiae with base about setae paler giving a 



mottled appearance asclepiadis 



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 1 to few sensoria dirhodum 



III of apterous female with 17 to 25 sensoria 



in 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 (8 more or 



less) 26 



IV of alate female typically without sensoria 

 (sometimes 1 to 3 present): crataegi 



26. Wing veins all heavy purpurascens 



Wing veins not heavy kaltenbachii 



*Distal part including sensorium. 



