GENERIC CLASSIFICATION OF APHIDIDAE. 51 
Genus SIPHONATROPHIA Swain. 
Plate VII, A-E. 
1918. SiphonatropMa Swain, Ent. News, v. 29, p. 363. 
Characters. — Head without prominent antennal tubercles. Antennae of five seg- 
ments and armed with circular sensoria. Fore wings with the media twice branched; 
hind wings with both media and cubitus present. Cauda elongate and ccsiical. Cor- 
nicles extremely short. Body of apterous form considerably arched. 
Type (monotypical), Cerosipha cupressi Swain. 
Genus YAMATAPHIS Matsumura. 
1917. Yamataphis Matsumura, Jour. Col]. Agr. Tohoku Univ., v. 7, pt. 6, p. 412. 
Characters. — Head without prominent antennal tubercles. Antennse of five seg- 
ments armed with small circular sensoria. Fore wings with the media once branched; 
hind wings with both media and cubitus present. Cornicles sub cylindrical. Cauda 
somewhat conical. 
Type (fixed by Matsumura, 1917), Yamataphis oryzae Mats. 
Genus TOXOPTERA Koch. 
Plate VI, DD, EE. 
1857. Toxoptera Koch, Die Pflanz. Aphiden, p. 253. 
1891. Ceylonia Buckton, Ind. Mus. Notes, v. 2, p. 35. 
Koch's genus was erected for his aurantiae, a well-known species on 
citrus, etc. Buckton erected his genus for a species he described as 
theaecola. Specimens of aurantiae from various regions and specimens 
of theaecola from Zehntner substantiate the placing of theaecola as a 
synonym of aurantiae. Ceylonia will then become a synonym of 
Toxoptera. Even if the two species were held to be distinct, this 
would necessarily be the case. 
Characters. — Head without prominent antennal tubercles. Antennae of six seg- 
ments, armed v?ith subcircular sensoria. Fore wings with the media once branched, 
hind wings with both media and cubitus present. Cornicles moderate in length, sub- 
cylindric, tapering. Cauda of moderate length, somewhat constricted near the base. 
Type (monotypical), Toxoptera aurantiae Koch (aurantiae Boyer). 
Genus VESICULAPHIS Del Guercio. 
Plate VII, M-Q. 
1911. Vesiculaphis Del Guercio, Redia, v. 7, p. 464. 
Characters. — Apterous form elongate ; antennas short, composed of five segments and 
situated on the under side of the head. Top of head forming a ledge which extends 
out over the antennas forming an angle in front of the eye; eyes protruding. Cornicles 
large, very much swollen and curved, opening minute and flanged; cauda somewhat 
conical, rounded at the tip. Anal plate rounded; posterior part of abdomen extending 
out over the anal plate and somewhat over the cauda. Alate form with six-segmented 
antennae armed with subcircular tuberculate sensoria. Fore wings with the media 
once branched, hind wings with both media and cubitus present. Cornicles somewhat 
slender, swollen, and slightly constricted at the tip. Cauda conical, not as long as 
the cornicles, anal plate rounded. 
Type (monotypical), Toxoptera carids Fullaway. 
This genus is one of those peculiar genera, like Aspidaphis Gillette, 
which seem to be related to Rhopalosiphum. 
