APIIIDID.E OF FdUJIOSA. 203 



(Dish'iljutiou") 



Formosa : Taihokn, Kiirim, Sliiiicliikti. 



Aphis malvoides v. d. Goot? 



(Host plant) 



Bidais 2yii'jsa : tba stalks aud rarely the uuder surface of the leaves are 

 attacked. 



(Season when the insect is common) 



The apliis is very common at an}- season, occasionally occurring in large 

 numljeis. 



(Winged vivipar. iU3 female) 



Mam- winged forms are produced fr-im time to time throughout the year. 



(Male and oviparous female) 



It is continuously parthenogentic all the year, never producing the sexes 

 in Formosa. 



(Disti'ilmtion) 



Formosa : Taihoku. 



Aphis pomi De Geer. 



(Host X)laut3) 



Fiius serolina : the lower surfaces of the young leave"-; are attacked. Near 

 Taihoku this aphis is present on this Pirns koia April to Oetolier, occasionally 

 occm'riug in large numbers. 



Glochidion Joiiunei and GlocJddion spp. : the young leaves are attacked. 

 jNIauy winged and wingless viviparous females were found on thes^ plants fi'om 

 FebruaiT to August, 1921, near Taihoku. 



(Season when the apliis is abimdaut) 



Near Taihoku the gi-eatest abundance takes place fi'om INIarch t j ^lay on 

 the Glochidion. 



(Winged viviparous female) 



The winged forms ai'e very common iu Formosa at s.u\\ tiiue. 



(JIale and oviparous female) 



Near Taihoku the sexuales do not seem to make their apivarance during 



