Aphiilidap of Formosa. — 1. 3 



Oshima, .lirector of tlie Agricultural Experiment Station, 

 Government of Formosa, for his kindness in publishing this paper. 



Thanks are also clue to tlie author's colleagues in this laboratory 

 for their kind assistance during the progress of this study. 



The author must also render gi'ateful thanks to Dr. C. P. 

 Alexander for kind counsel and advice. 



\ 



Family Aphididae. 



(1) Parthenogenetic females viviparous; sexual females oviparous. 



Subfamily Aphidinae. 



Parthenogenetic and sexual females always oviparous 



Subfamily (Jhermesinae. 



Subfamily Aphidinae. 



(1) Cornicles very elongate, provided with numerous long bristles 

 or wingless females covered with many prominent elongate 



branched projections Tribe Trichosip/iina. 



Cornicles long or short, or sometimes absent, never provided with 

 numerous long bristles; wingless females never covered with 

 many prominent branched projections (2) 



(2) Last antennal joint with a distinct spur or terminal process, which 

 is almost always as long as or longer than the base, if shortei'. the 



Cauda wart-shaped and the anal plate sinuated (3) 



Last antennal joint with a short spur (4) 



(.■)) Cornicles usually not very short; cauda not constricted at the 



base; anal plate not bilobed ... Tribe Aphidlna. 



Cornicles usually verj^ short; cauda often constricted at the base; 



anal plate often bilobed Tribe CalUpter inn. 



(4) Aleyrodiform Stages often developed; anal plate often sinuated; 



cauda often constricted at the base Tribe HormaphidiiKt. 



Aleyrodiform Stages not developed; anal plate not sinuated; 



cauda not constricted at the base. .., (■')) 



