GENERIC CLASSIFICATION OF AFHIDIDAE. 57 



Characters. — Head with prominent diverging antennal tubercles. Antennae of six 

 segments armed with subcircular prominent sensoria. Fore wings with the media 

 twice branched, hind wings with both media and cubitus present. Cornicles short, 

 about the length of the cauda and rather thick, usually with conspicuous polygonal 

 markings; cauda large, slightly constricted near the base. 



4 . Type (fixed by Del Guercio, 1911), Aphis atrum Pen*. 



Ge~us MACROSIPHTJM Passerini. 



Plate VIII, U-W. 



1860. MderosipJium Passerini, Gli Afidi, p. 27. 



1855. Siphonophora Koch, Die Pflanzenlause Aphiden, p. 150. 



1887. Ne.ctarOt-nora Oestlund, Minn. Geol. Survey Bui. 4, p. 78. 



1913. Macrosiphon Del Guercio, Redia, v. 9, p. 188. 



In 1855 Koch used the generic name Siphonophora for this genus 

 for which Passerini substituted Macrosiphurn. Not aware of this 

 Oestlund, seeing that Siphonophora was preoccupied, substituted 

 Nectarophora and strangely enough used Macrosiphurn for another 

 genus in a different sense, Del Guercio uses Macrosiphon in this 

 sense. 



Characters. — Head with pro min ent diverging frontal tubercles. Antennse of six 

 segments, armed with subcircular sensoria. Fore wings with the media twice branched ; 

 hind wings with both media and cubitus present. Cornicles long, subcylindrical, 

 mostly somewhat tapering; cauda long, somewhat constricted about the middle. 

 Sexes with the male usually alate and the oviparous form apterous. 



Type (fixed by Passerini, 1860), Aphis rosae Linn. 



Genus MEGOURA Buckton. 



1876. Megoura Buckton, British Aphides, v. 1, p. 188. 

 1913. Drepaniella Del Guercio, Redia, v. 9, p. 188. 



The genus Megoura Buckton is similar to Amphorophora in that 

 prominent antennal tubercles are present. It differs, however, in 

 that the cornicles are short, about equal in length to the cauda. 

 Buckton erected the genus for his viciae which Schouteden con- 

 sidered the same as viciae Kaltenbach. It certainly is very similar 

 in every respect. 



Viciae Kalt. was set as the type of his genus Drepaniella by Del 

 Guercio, therefore Drepaniella will become a synonym of Megoura. 



Characters. —Head with distinct antennal tubercles. Antenna? of six segments, 

 armed with subcircular sensoria. Wing venation normal; cornicles moderately long 

 and swollen in the middle. Cauda about the same length as the cornicles. 



Type (monotypical), Megoura viciae Buckton. 



Genus MYZTJS Passerini. 



Plate VIU, L, M, X-Z. 



1860. Myzus Passerini, Gli Afidi, p. 27. 



1860. Rhopalosiphum Passerini, Gli Afidi, p. 27. 



1913. Myzoides Van der Goot, Tijd. voor Ent., v. 56, p. 84. 



1913. Ovatus Van der Goot, Tijd. voor Ent., v. 56, p. 84. 



1914. Myzodes Mordwilko, Faune Russ. Aphidoidea, p. 52. 

 1914. Aulacorthum Mordwilko, Faune Russ. Aphidoidea, p. 5S. 



1916. Neomyzus Van der Goot, Zur Kennt. der Blattlause Java's, p. 50. 

 1918. Myzopsis Matsumura, Trans. Sapporo Nat. Hist. Soc, v. 7, pt. 1, p. 19. 



