108 nVOIClII TAKAH.VSni: 



(Obscrvjitioiis near Tailiukn) 



Neai' Taili'jku tlie author has oLscrve.l many winged and wingless vivipar- 

 ous females on October G, 1920, and October 5 and 16, 1921, on a plant of 

 the GraminoM ; and also on Jnne 23, and July 30, 1921, on Sorghum. 



(Disti'ibntion) 



Foi'mosa : Taihoku ; Shinten. 



Jajx'in : Tokyo (Meguro) 



Aphis miscanthi Takah. 



(Host plants) 



Miscanf/nis sj-)p. : the un.Jer surfaces of tlio basal parts of the loaves arc 

 attacked. 



(Season when the insect is common) 



Near Taihoku tiiis species may bo seen rather cimmouly at any season, 

 tliough always occun-ing in small numbers. I have never observed it in 

 abundance. 



(AVinged viviparous fe:nalo) 



Tlio winged forms appear at any season, but are tjuito scanty in number. 



(Male and oviparous female) 



Tlie sexual forms have never beeii ob.served in Formosa, viviparous in- 

 dividuals being seen fit all times. 



( Intermediate) 



No intorniediattis have been found. 



(Comnnmal life) 



Tlie wingk'ss females arc rarely ft)und in the colonies of Orcgma lanujera 

 (/ehnt.) on the Miscaiithvs. The colonies of this si^ccies are almost alwaj-s 

 covered witli ti-nts liy the ant. 



(Hid lit) 



This .species is quite inactive, gi-ouping very densely, and does not elevate 

 the logs when disturbed. 



(Disti'ibution) 



Formosa: Taihoku, Urai, Kagi, Kwanshirti, Koshun. 



