110 r.YOICUI TAK.UI.VSUI: 



(lutermecliute) 



No interniecliates lui\c ever beeu discovered. 



(Habit) 



This si^ecies is very iiuictive, gi-oupiug, though not dcnisJy, ou the lower 

 surfiice of the leaves, especially along the midribs. It does uot elevate the 

 posterior legs uor drop to the gi'oimd even whou greatly disturbed. 



(Color vaii.'itio.'i) 



The general coloiu' is usually yellow, but many diu-k green individuals 

 may be found in the late autumn and the; winter. 



(Distribution) 



Formosa : Tailiuku, Sozan, Urai. 



Aphis ficicola Taka. 



Host plant. —i^/c?/.s wiijIdUinii. 



This species is very rare, only a few wingless viviparous femelos having 

 been observed on the young hvives on April 23, 1920, at Taihoku. 



Aphis somei Essig et Kuw. 

 (PI. HI, A, fig. 1) 



A. Observations iu Formosa. 



(Host plants) 



Sapiuni sehifcrum : the aphis is sometimes observed in abundance on the 

 leaves and young shoots from about Jime to August. 



Bischojia Javanim : some vivip irons femjiles were obsened ou the lower 

 side of the jouug leaves in February, March and Septemlx>r. 



Ilepkipleurum udopJtyUuin : many M'iugless viviparous females were observed 

 fit'ding on tlie fruits or the luaves on March 5 and INIay G, 11)21, near Taihoku. 



Pittosporuiii tohirn : a few wingless ones on the leaves ou March 22, 1021, 

 at Sbinkwa. 



Vibimium formos'tnum : many wingless ones in Marcli, 1921, and iu July, 

 1922, at Shiuteu, near Taihoku. 



rohjfjonum mullijloruiii : many wingless ones ou November 2 ), 1921, at 

 Taasui. 



