APIIIDID.-E ( )F FOEilO.SA. 109 



Aphis droserae Takali. 



Many A\iDgles? aud winged viviparous females were oljsiuved on the 

 stalks of tlie flo«'evs aud the lower side of the leaves of Droscru lottrcrii, a 

 v\'ell knowu iusectivorous plaut, at Sozau, ueav Tailioku, on Febrnan' 27, 1821. 



Aphis kurosawai TakaL. 



(PL V, A, figs. 5—6) 



Manv wingless and winged viviparous females were observod feeding on 

 the leaves aud the dLstal parts of the stalks of Artcmtsio vi'Jg iriv var. indict 

 ou March 5, 1921, at Shiriu, near Taihoku. 



Aphis nastiirtii Koch? 



Stdlariu idiginosa : some wiugless viviparous females and a few wingel 

 cues were oljserved ou March 5 and 17, 1921, uear Taihoku. 



SteUaria aquuiica : a few wingless forms aud nymphs of the winged one^ 

 were observed ou IMarch 11, 1921. uear Taihoku. 



Aphis shirakii Takah. 



(Host plant) 



Ilelastoinc ccin<Ji<luin : the lower siu'faces of the lea\"e3 are attacked. In 

 the summer a few wingless forms are sometimes found feeding on the fruits. 



(Season when the insect is comuiou) 



Near Taihoku this aphis is common, sometimes occurring in large numbers 

 iu almost any month except dime, July aud August, daring which period its 

 numbers are often so reduced that it is difficult ti> find. 



(Winged viviparous female) 



The winged fijrms appear at any season, but are exti'emely rare, near 

 Taihoku, fi'om Mav' to September. 



(Male aud oviparoiis female) 



Near Taihoku tliis aphis is continuously viviparous throughout the year, 

 uot producii:g the sexes. 



