Al'niDID.E OF FOKMOSA. 75 



generation near Taihoku, as well as near Tokyo. 



(Male and oviparous female) 



Near Taihoku it is continuously viviparous tlu'ougliout the year and no 

 sexes have been observed, but near Tokyo the winged males and wingless 

 ovijiarous femixles occur frcmi the last part of October and may be seen until 

 as late as the last of Noveinlier. 



(Intermediate). 



The brachyptercius forms are extremely rare as in other Bl-'crosijJnuri, only 

 one having beeu observed on September 7, 1920 near Taihoku. But, when 

 the winged viviparous females are parasited by a species of Cbalcididi© iu the 

 second or thitd nymphal instar, their wings often fail to expand, although 

 developing as normal wings up to the last nymphal stage, and they become 

 brachypterous forms, which do nut difler iu structural characters from the 

 normal Aviuged ones except in the abnormal wings. 



(Habit) 



The aphis directs the head do\vu\\ard6 when at rest, moves the abdoiiien 

 from side to side when approached, and drops to the ground when disturbed, 

 like many other sp.^cies of Macroslphviu. 



(Distribution) 



Formosa : Kiirun, Tansui, Sozm, Taihoku, Shirin, Urai, Kagi, Kwanshirei. 



Japan : Tokyo. 



Macrosiphum neoartemisiEe Takah. 

 (PI. YI, B, fig. 1) 



(Host plant) 



Artemisia capillaris : the distal portions of the stalks are attacked. This 

 aphis S[end3 the entire life on this plant, not alternating the host. 



(Season when the species is common) 



Near Taihoku this aphis is rather common at all seasons, Ijut usually 

 does not occur in abundance. 



(Winged viviparous female) 



The wnged forms appear at any season, but are \ery few iu nuniber. 



(Male and oviparous female) 



