ArniDID-E OF FORMOSA. J 15 



iiuniina. 



(lutermediiite) 



Nn intermediates have been (il)sevverl. 



(Distribution) 



Japan : Tokyo, Sappor< >, etc. 



Greenidea taiwana Takah. 



Host plant— il/f^ws/Hrt rJioi/oIiu. 



This aphis is rai'e, some wint^ed and ^ving^es3 vivipanins female-; havinii: 

 been observed ou the y<iung loaves on Jniic "21, 1920, at Shinteu, near 

 Toihoku, Formosa. 



Greenidea quercifoliae Takah. 



Host plant. — Quercus variahilis. 



This is also very rare, only a few wingless viviparous females having lieeu 

 observed ou the joimg leaves on May 29, 1920, at Taihoku. 



Greenidea formosanum (Maki) 



(Host plants) 



Psidium (juijava : the young shorits and the lower surfacj (if the tender 

 leaves are attacked. 



Bhodoimjrtus tomentos'i : tlio distal parts of the sho:jts and the tender 

 leaves are attacked. 



(Season when the insect is oomm(jn) 



This aphis is rather common, near Taihoku, in April and ]\Iay, but does 

 not (iccur in abimdance. Its nuiiilxn'S are greatly reduced during tlie months 

 of July to October, during wliich period it is oft^n exti-emely ditlicult to find 

 in the field. 



(Winged viviparous female) 



The winged forms are produced froui time to time at any seas )n, but 

 always in small numbers. 



(Male and o\iparous female) 



