Al-niDIDJi; OF FORMOSA. 



IE: 



(Distribution) 

 I'onuosa : Tiiiliokn. 

 Japau : Tok^'o. 



Dilachnus pinidensi florae (Essig ct Kmv.) 



Host plants. — Finns sj). and Piuus massonvma : tlie Ivwav sides of the twigs 

 are attacked. 



A few wiugkss and rmnaerous winged, viviparons females :vere observed 

 ou February 19, 1921, a few nymplis on March 8, mimeruus wingless in- 

 di\idiials on March 30, and a few winged and uninerous wingless Yi\iparons 

 feiLales ou July 30, 192"2, ne:xr Tailmku. 



This aphis gimips very densely and has the habit, when disturbed, of 

 elevating the posterior pair of legs. 



Lachnus tliujafoliae (Theob.) 



(Host plant) 



Thvju oricniaJ'is : the twigs, especially the lower side, are attacked, and a 

 few wingless forms are sometimes found ou the leaves. 



(Season when the insect is commai) 



Near Taihoku this aphis is rather rare, usually occurring iu veiy rosti'icted 

 numbers, but the author has oliserved the wingless viviparaus fiauales in 

 abundance on June 80 and July 8, 1922. 



Near Tokyo it may be seen not uucommonly, liut is uot often alnmdaut. 



(Winged \iviparous female) 



The winged foi'ms are exti-emely rare, Init I have observed one or two 

 nymphs of the winged forms on July <5 and 25, and November 11, 1920, May 

 27, 1921, and Jime 30, 1922, near Taihoku. 



(Male and oviparjus female) 



Near Taihoku it is viviparoiLS all the year, ^\ithout producing the sexual 

 forn.s. 



(Intermediate) 



No intermediates l.ave l)eeu noticed. 



(Habit) 



