APHIDin.^ OF FOPaiOSA. J47 



It is coutiunimsly viviparous tlivoughont the year, uo sexn;iIos liaving hcou 

 f'luud near Taibokii. 



(lutermediate) 



Nu intermediates have been observed. 



( Habit) 



The wicgless forms are black iu colour, very hard, aud aleurodiforni, beiug 

 completely cemented to the leaf. The young nymphs, however, are yellow 

 aud walk about ou tlie leaves of the host plant. The aphis does not group 

 dens.'ly, directing the head iu indetinite directions. 



(Distribution) 



Forme sa : Taihokn, luiruu, Toyen, Koheki. 



Astegopteryx quercicola Takah. 



(Host plant) 



Qucmis serratn : the lower, and sometimes the upper, surfaces oi the 

 leaves are attacked. 



No galls are produced. A winged viviparous female was observed laying 

 more than teu nymphs on a leaf of Coloc'sln anfiquoruta (in March 20, 1922, 

 near Tiiihoku. 



(Season when th' insect is common) 



Near Taih<jkn this aphis is very common on the Qtiercus all the year, 

 hAng most abundant iu November and December, its numbers sometimes 

 conspieuoiisly reduced fi'om May onwards throughout September. 



(Winged viviparous female) 



Many winged forms make their appearance from the last of November to the 

 beginniug of March. Their uymi^hs are rather flat, and yellowisn in colour, 

 prcjvided with much white wax on the bodj'. 



(Male aud oviparous female 1 



No sexuales occur near Tailcoku, where it is continiiiusly viviparous 

 throughout the year. 



(lutermediate) 



No intermediates have been observed. 



(Some notes on the life history near Taihoku) 



The wingless adults are black iu coloiir, very hard, and aleurodiforra. 



