( 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 antennal tubercle, and of the first joint of the antennae. 
21. Phorodon humuli, Schkank. 
Aphis humuli, Schrank, Faun. Boic., II, 110, 1199. 
pruni, Mahaleb, 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. 
Genus 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, Fitch. 
Aphis cerasifoliae, Fitch. 
Black, abdomen green. On leaves of Cerasus vir- 
giniana. 
25. Myzus persicae, Sulz. 
Aphis persica, Sulz , Hist. Ins., 105, PI. II, Fig. 4, 5. 
institia, Koch, Pflanz., 58, Fig. 74, 75. 
persicaecola, Boisd. 
persicophila, Bondani. 
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. 
