70 KYOU'III TAKAIIASHI: 



(Sonic notes on tlio life liLstur}- ncir Tokyo) 



Near Tokyo the foiiialos of ilie 1st gouoratiou (stom-mothers), which np- 

 )H>iU' about tho iiiitkllo of April, nvo ahvays wingless, as is common in miiuy 

 species of plant-lice, but those of each of the 2ud and subsequent generations 

 are ■\\ingo<l <>r wingless, '\^^llotller the soxuparas are winged or wingless has 

 never been detern.incHl. The winged males and wingless oviparous females 

 occur on the Cirs'mia Japonicvin from the 1st week of November on. The 

 eggs have a gieenish colour \\hen iie\\ly laid, gi-adually darkening to a deep 

 bluck. S >me individuals feeding on the ^l/c/iW7?i /o|>p:( are ■viviparous through- 

 out llie winter, but others ou the same plant sometimes i^roduce the sexuales 

 as late as December. 



(Habits) 



This aphis has the habit of directing the head downwards when resting 

 o!i tjie host. The wingless ^i^ipiroas females, when disturbed, sometimes 

 secrete a reddish yellow lluid from the cornicles. 



(Communal life) 

 M'lcrosiphnni f/ohmis and Macrosiphum cirsicda Takah. are sometimes found 

 in gixnips on Oirsimn joponicitm in Japan, as well as in Formosa. They are 

 ];ot tended by ants. 



(Distribution). 



Formosa : Kiirun, Shirin, Taihuku, Shinten, Urai, Mariiyama, Kagi. 



Japan : Tokyo, Chiba, SaitaiLa, Sapj)oro, etc. 



Macrosiphum ibotum Essig et Kuw, 

 d'l. 1\, A, figs. 5—10) 



II(j3t plant, — Liijxatrviii ihofa, attacking the lower surface of the leaf. 



St)me wingless viviparous fiMiiales which were probalily sexupara', wing- 

 less oviparous females, and winged males were collectetl ou Xo^'euder 29, 

 1919, near Tokyo. 



0\'iparous female : ^-eilow ; wingless ; auteniue provided with a rather 

 .'^mall seusorium i:ear the bjiso of the 3rd joint ; hind tibia) provided with 

 numerous rather small circular seusoria scattered almost over the whole length, 

 coinicles iuibricated, not reticulated. 



