I 



(9) 



Genus Phorodon. 



Similar to Siphonophora in some respects, and to Aphis (restricted) 

 in others. Chief distinguishing character, the spine-like prolongation of 

 the inner side of the auteunal tubercle, and of the first joint of the antennae. 



21. Phorodon humuli, Schrank. 



Aphis humuli, Schrank, Faun. Boic, II, 110, 1199. 



pruni, Malialeb, Fonscol., Ann. Soc. Ent. Fr., X, 175. 

 Phorodon humuli, Passerini. 

 The well known and injurious Aphis of the Hop-vine ; the cause of 

 the "Blight." Green. 



GeMus Myzus. 



Too closely allied to Phorodon, the chief difference being that the 

 frontal tubercles are not porrected in the female, and that the first 

 antennal joint is only gibbous. 



22. Myzus cerasi, Fab. 



Aphis cerasi, Fab., Syst. Ent., 734, 4. 

 Myzus cerasi, Pass. 



Shining black. On cherry leaves. 



23. Myzus? cerasicolens, Fitch. 



Aphis cerasicolens. Fitch, Senate, No. 30, 65, 1851. 



Pale greenish yellow. On Cerasus serotina. 



24. Myzus ? cerasifoliae, Fitcu. 



Aphis cerasifoliae. Fitch. 



Black, abdomen green. On leaves of Cerasus vir- 

 giniana. 



25. Myzus persicae, Slilz. 



Aphis persica, Sulz , Hist. Ins., 105, PI. II, Fig. 4, 5. 



institia, Koch, Pflanz., 58, Fig. 74, 75. 



persicaecola, Boisd. 



persicophila, Rondani. 

 Myzus persicae, Pass. 



Red and brown On the Peach and Nectarine. 



26. Myzus ribis, Linn. 



Aphis ribis, Linn., Syst. Nat., II, 733. 

 Rhopalosiphum ribis, Koch, Pflanz., 39, Fig. 50, 51. 

 Myzus ribis. Pass. 



Green to yellow. On leaves of Red Currant. 



