80 RYOIcm TAKAnASril : 



Of tlic>so plants the imist fnvorod hosts are Duranta ■jilinairri, Nicotiana 

 tahucurn, BnisMca deraccac, Rhaphanus sativus, etc., on wliicli plants tlie insect 

 sometimes occurs in euomorous uumbei-s, jirotlucing a oonspicnmis infestation. 



(Season wlieii the iasect is coiumou) 



Tlie siMcies is one of the mo-st common in Formosa \\here it is ;most 

 abimdimt apparently' in the winter or spring, its numbers being redncetl during 

 the sunuijcr. 



(Winged vi\ipirons female) 



The winged forms are to bo found at any sea-son iu Formosa,' as_^w'ell as 

 in Japan. 



(Male and ovipirous female) 



It is continuously viviparous all the 3oar, usually without producing the 

 sexes near Taihoku, as well as near Tokyo. However, a few wingetl : males 

 and their nymphs were found in a colony on Solannm vielongena on Mach'"21, 

 1922, near Taihoku, although no oviparous females were observed. 



No reason for the occuitgcco of these male insects was foimd. 



(Intermediate) 



No iutermediats have been foimd in Formosa. 



(Communal life) 



M)jr.ns persicae (SiUii.) and Aphis (jossypii Glove or EliopalosipJimn 

 jKvudobmmtKB (Davis) are sometimes found in gi-oups. Not attended by ants. 



(Disti-ibutiou) 



Formosa: Taihoku, Sliiriu, Tansui, Kiirun, Shiuton, Ako, Nanto, . Mato, 

 Kngi. 



Japan : Tokyo, Sapporo, etc. 



Myziis momonis Mats? 



Host plant. — Fnuius pi r^iru. 



The lower siu'faces of the leaves are attacked, and the infested lea\es ;irj 

 rolletl. Many wingless viviparous females were observed on Juh" 17, v 1921, 

 at Kappmzan, Formosa. 



