ArHIDID.E OF FOKMOS.V. 2^9 



Ne;u' Tiiilioku this species is very rnre, ouly tlw wiu.^losi vivipiiiMiis 

 females baviug lx?eu (:)l)ser\-«xl iu sm;ill nuiul>ers from Jimo to October. 



Near Tokyo tlie wingless viviparous females maj' be seen rather commonly 

 from June to October, occasionally occurring in great abuucLiuce. 



(Winged viviparous female) 



No TriDgecl viviparous females have lieen dLseovered in Formosa nor in 

 Japan. The sexupara> are wingless. 



(Male and oviparous female) 



Near Taihoku, no sexual furms have lecu foui;d, lait uearTrk'so, uumerou? 

 oviparous females m;ike their appearance from Juh' dUWiU'd throughout the 

 summer, and it is a very remarkable fact that they are always provided with 

 wings as in some species of Grcaddea. 



E;ich ovij^arous female de]x>sits aViout five eggs which are yelln-w when 

 newly produced. No males have lieen t)l.>served. 



(Intermediate) 



No intermediates have been fiiuud in Formosa and Japan. 



(Ilabit) 



This aphis is quite inacti\e, Ui.it elevating the posterior legs nor dropping 

 to the ground when disturbed. It is sometimes attended tiy Fdijrhiichh divs 

 iu F(_irii;osa. 



(Dish'ibutiou) 



Formosa : Taihoku. 



Japan : Tokyo. 



Myzocallis bambusicola Takah. 



(Host plants) 



Ikitdrocahimus laHflorus : the Vmcv sm-faccs of the lea^'es are attacked. 

 Btinibusa skmodacLya : the young shoots are seldom attacked. 

 (Season when the insect is common) 



This aphis is rather rare near Taihoku, not occuiTing iu abundance. 

 (Winged %iviparous female) 



All the viviparous fei^ales are alw.ays provided witli wings as iu other 

 species of 3LjZ()C(dUfi. 



