GENERIC CLASSIFICATION OP 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 conical. Cor- 

 nicles extremely short. Body of apterous form considerably arched. 



Type (monotypical), Cerosipha cupressi Swain. 



Genus YAMATAPHIS Matsumura. 

 1917. Yamataphis Matsumura, Jour. Coll. Agr. Tohoku Univ., v. 7, pt. 6, p. 112. 

 Characters. — Head without prominent antennal tubercles. Antennae 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. 



1S57. Toxoptera Koch, Die Pflanz. Aphiden, p. 253. 

 1891. Ceylonia Buckton, Ind. Mus. Notes, v. 2, p. 35. 



Kooh's genus was erected for his aurantiae, a well-known species on 

 citrus, etc. Buckton erected his genus for a species he described as 

 tlieaecola. Specimens of aurantiae from various regions and specimens 

 of tlieaecola from Zehntner substantiate the placing of tlieaecola 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 with 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 VESTCULAPHIS Del Guercio. 

 Plate VII, M-Q. 

 1911. Vesiculaphis Del Guercio, Redia, v. 7, p. 464. 

 Characters.— Apterous form elongate ; antennae 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 antennae 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 tuber culate 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 caricis Fullaway. 



This genus is one of those peculiar genera, like Aspidaphis Gillette, 

 which seem to be related to Rhopalosiphum. 



