S(; RYUICUI TAKAHASIII: 



Amphorophora magnoliae (ri5;iji; ct Kuw.) 

 (ri. YI, V>, figs. 4—5) 



Syii. Bli'ipalosiplona matjiioliac, Essig and Kiiwiiiui, rroc. Calif. Acad. 

 S.-. viii, 3, p. 59 (1918). 



lUiop-iloslphuin s^ihilvciaJ", TakaluisLi, Zuol. IM;ig. Tukyo, xxx, p. 372 

 (1918) and rroe. liitniu. Hoc. "Washington, xxi, 7, p. 17G (1919). 



This apliis Ls one of the n.o3t common six.>cies near Tukyo, where no 

 tiviparons females are produced tliroughout the }ear, and the life history is very 

 foiiiplicatcd. The fall migi'aiits (pseudosexiijiarae) letm-u to the ^\■int'Jr host, 

 S'lmhi'fva raccmom, during the months of October and November and 

 pindr.ce the young u^wn the under surface of the leaves. Most of these young 

 develop into wingless \i\iparous fenides, ^^hile a fe%\- accpiire wings, remove 

 iigain in-t other Saiitbi'cus raccmosn, and produce -wingless vivip.irous females. 

 As tlie leaves of (he winter host begin to fall, the lice locate themselves upon 

 till- lower side of the buds, where they survive the wint.r. The parthe- 

 nogenetic reproduction, which consists of wingless forms, is can'ied on generation 

 after generati.)n during the winter, although reduced to a low rate. The aphis 

 becomes exti-emely abiuidaiit in April, in which mouth the spring migrants 

 (winged viviparous females) are produced. These migrants entirely leave the 

 wiut -r host and fly to a very wide range of the summer hosts, some of the most 

 im])oi-tai.t of which are Ofo-sd-m (nikulatu, Dioscorea japanica, Lafjcrsli-oemia 

 indie I, etc., and produce young. Most of Ihese young become wingless forms, 

 but a few inquiring wings fly ;igain t<i diflerent Sf^ecimens of the summer hosts 

 and prixluce only wingless forms. 



After a few wingless generations on the summer hosts, wiuged females 

 aj)])ear, once more, in Julo or July, tliese flying to diflercnt specimens of 

 the bummer hosts and producing a few v\ingctl and lujiu}- wingless foi-uis. 

 These winged fonas again move io diflerent S[xcimens of the smumcr hosts 

 and all their yoimg are wingless. Then follow many wingless generations 

 one after another on the summer hosts tlu'oughout the siuumer ;ii.d autumnal 

 .s-.'.'r^ons until finally the fiiU niigiiuits (])seudosexuparae) lujike thoii' apix;ai"ance, 

 and, as aheady mentioned, return to the winter host, Sunihucm raccmosa, and 

 jn-oduce the young A\hich aiv comjjrised u! a few winged and many wingless 



