ART. 20 THE APHID GENUS AMPHOROPHOEA MASON 7 



8. Cauda not constricted, with 2 or 3 lateral hairs 9 



Cauda long, slightly constricted, with 3 lateral hairs 10 



9. Cauda with 2 sets of lateral hairs alni, new species. 



Cauda with 3 sets of lateral hairs azaleae, new species. 



10. Antennae and cornicles dark colored 11 



Segment III and cornicles hghter 12 



11. Widest diameter of cornicles about one half length of base of VI. 



borealis, new species. 

 Widest diameter of cornicles more nearly one-third length of base of VI. 



vaccinii, new species. 



12. Ill about twice the width of head through eyes spiraecola (Patch). 



Ill about one and one-half times the width of head through the eyes. 



rhododendronia, new species. 



13. Ill half as long again as cornicles 23 



III shorter 14 



14. Ill with 40-50 sensoria nabali (Oestlund). 



Ill with 0-30 sensoria 15 



15. Ill without sensoria nervata (Gillette). 



Ill with sensoria 16 



16. Ill with 1-2 sensoria 17 



III with 4-30 sensoria 19 



17. Cornicles black formosana Takahashi . 



Cornicles green or white 18 



18. Cornicles green. On Pine evansi Theobald. 



Cornicles white. On Polia takahashii, new species. 



19. IV and V with sensoria 20 



IV and V without sensoria 21 



20. Ill with 17-20 sensoria. IV with 3-6 sensoria carduellina Theobald. 



Ill with 22-28 sensoria. IV with 10 sensoria. V with 4-6 sensoria. 



oleraceae (v. d. Goot). 



21. Cauda long, broad, not constricted, hairs shorter than width 25 



Cauda constricted, with hairs longer than width 22 



22. Antennae with capitate hairs as long as width of segments. 



pergandei, new species. 

 Hairs inconspicuous, much shorter than width of segments. 



cosmopolitana, new name. 



23. Ill with 7-18 sensoria grouped near base laingi, new species. 



Ill with sensoria along entire length 24 



24. Very large species. On Ferns ampuUata Buckton. 



Smaller species. On Rubus sensoriata Mason. 



25. Unguis of VI distinctly longer than III (If times longer). 



zhuravlevi Mordvilko. 

 Unguis of VI shorter or subequal with III 26 



26. Cornicle light colored. Cauda with 5-6 lateral hairs rubi (Kaltenbach). 



Cornicle dark. Cauda with 3-4 lateral hairs amurensis Mordvilko. 



AMPBOROPHORA ACONITI (Van der Goot) 



Figs. 169-173 



Rhopalosiph^wi aconiti van der Goot, Tijdschr. voor Ent., vol. 55, 1912, 

 p. 73; Beitrage zur Kenntnis der Holljindischen Blattlause, 1915, p. 140. — 

 Theobald, The Entomologist, vol. 50, 1917, p. 81. — Wilson and Vickery, 

 Trans. Wisconsin Acad. Sci. Arts and Letters, vol. 19, pt. 1, p. 29. 



One alate and one apterous specimen, sent by Van der Goot, are 

 available for study. 



