Vol. VIII] ESSIG & KUWANA—SOME JAPANESE APHWIDJE 



Vihurnum tomentosum Thunb. (Yabudomari) 



Aphis somei, new species 

 Vicia foba equina Pers. (Soramame) 



Aphis medicaginis Koch 



Wheat 



Aphis avence Fab. 

 Zelkova acuminata Planch. (Keyaki) 



Aphis medicaginis Koch 



43 



NOMENCLATURE OF WING VENATION 



C 



Figure 1. — Nomenclature of wing venation used in the text: C, costal; 

 Cu, cubitus ; M, media ; R, radius ; Rs, radial sector ; Sc, subcostal ; 

 St, stigma or pterostigma. This form is the system usually used by 

 European writers and by many others. (Original.) 



