GENERIC CLASSIFICATION OF APHIDIDAE. 57 
Characters. — Head with prominent diverging antennal tubercles. Antennae of six 
segments armed with sub circular 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. 
Type (fixed by Del Guercio, 1911), Aphis atrum Ferr. 
Ge~us MACROSIPHUM Passerini. 
Plate VHI, U-W. 
1860. Macrosiphum Passerini, Gli Afidi, p. 27. 
- 1855. Siphonophora Koch, Die Pflanzenlatise Aphiden, p. 150. 
1887. Nectar oritur a Oestlurtd, 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 Macrosiphum. Not aware of this 
Oestlund; seeing that Siphonophora was preoccupied, substituted 
Nectarophora and strangely enough used Macrosiphum for another 
genus in a different sense, Del Guercio uses Macrosiphon in this 
sense. 
Characters. — Head with prominent diverging frontal tubercles. Antennae of six 
segments, armed with subcircular sensoria. Fore wings with the media twice branched ; 
hind wings with both media and cubitus present. Cornicles long, sxibcylindrical, 
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 MEGOTJRA 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. Antennae 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 VIII, L, M, X-Z. 
I860. Ifyzus 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 Puss. 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. 
