104 KYOICIU T.UiAU.V.SHI : 



the yeai', even in the winter, since the author Las olsoiTed tlie viviparous 

 females in the first week of Febriiar}' ou the Glochidion. 



(Communal life) 



ApJiis pomi De Goer and A. gossijpii Glov. are sometimes found together 

 in groups on the P/rws-leaves. 



(Distiilmtion) 



Formosa : Tailioku. 



Japan: Tokyo, etc. 



Aphis nerii Bo^er. 



Host plant. — ■Asclepius rurassavici, attacking the lower side of tlie Ijranch 

 and leaf. The wiuged and wingless vi\-ip;U'ou5 females were observed in 

 enomoroas numbers in October and Novemlwr, 1921, near Taihoku. 



"WTien at rest, the s^xicies directs the head downwards and h:us the habit, 

 when distui'bed, of moving tlie abdomen and tlio posterior pair of legs like 

 many si»cics of Macrofsip/aun. 



Aphis saliceti Kalt. 



(Host plants) 



S'dix tmrhimjii : SuU.c spp. : the distal parts of t!:e youtig twigs are 

 attacked. 



(Observations near Tokyo) 



Tliis ayihis may l)o seen occasionally in large numbers fi-om Juue to 

 September, during which period the winged forms are pi'oduced from time to 

 ti me. 



Tiio species is usually dark green in colour, but many orange yellow 

 individuals (3ccur in June and July. The author has never observed the sexual 

 fjrms. 



(Observations near Taihoku) 



Near Taihoku it is rather uncommon, usuilly occurring in small numlnjrs, 

 but I have (ib3er%-ed it in gre;it numbai-s in Septeinl)er and October. The 

 \\inged forms are very scanty in numlxjr, although they may 1x3 produced at 

 any season. 



