78 RVOIlIlI XAK.\U.LSHI: 



Macrosiphoniella tanacetarium (Koch) 



(H)st plant) 



Artemisia vuiijaris, var. indicn : tiw distal paiis of the stalks iU'c attjicked. 



(Siiasou wlioii tiic insect is common) 



Near Tailnjkii tliis sjiecies is veiy lure, occumng in very small numbers. 



A lew wiiijfless viviparous females were obsen-od on June ■2(), 1920, and 

 April 3 and October :], 1921, near Tailioku. Near Tokyo the wingless 

 vivipu-ous female may bo seen not uncommonly fi-om the beginning of August 

 to the flret week of Octolier, during which period no winged forms have been 

 observed. 



(Winged viviparous female) 



Near Taihoku I have never observed auv- winged forms. Near Tokyo 

 winged ones occur in the fall, wliicli are i)roljably sesnpar.e. 



(Male and oviparous female) 



Near Taihoku this aphis seems to be continuously viviparous all the year, 

 but near Tokyo a few winged males and many wingless ovipai'ous femaks 

 occur from the last of October. Tlie sexuparie seem to be wingle.ss or winged. 



(Intermediate) 



No intermi'diates have been fnnid. 



(Distribution) 



Formosa : Taihoku, Urai. 



Japan : Tokyo. 



Myziis formosanus Takah. 



Host plant. — roh/(jo)ium chincnsis, attacking the lower surface of the leaves. 

 The infested leaves are rallied. 



Some wingless vivipai-ous females were observed on ]\Iay G, 1922 ue;ir 

 Taih.ku. 



Myzus persicae (Snlz) 



(Host plants in Formosa) 



Acer, spcdcs : a few nymphs of the wingless form were obseiTe<l on the 



