236 KYOKIir TAK.VJI.VSIII: 



This apliis is wry inactive, very deusely gi'onpiug ou the twigs or in the 

 fissures of the steins or twigs. It dcjcs not elovjite the posterior pair of legs 

 even when distiu-Lccl. Th > (linsctions of the lieads, when at rt"St, are variaus. 



(Communal life) 



Th(> colonies of this sp:;cie3 are sometimes covered with the tents by 

 Crcmatorj'ister rogcnhcferi. 



(Distribution). 



Japan : Tokyo. 



Formosa : Taihoku. 



Tuber olaclinus viminalis (Fousc.) 



Host plant. — Salix tmrhurijii, attacking the lower surface of tlio liranches. 

 Some winged and wingless -viviparous females were observed ou April 29, 1920, 

 and February 7, 10, 21, and 27, 1921, near Taihoku, -where it seems to pass 

 the winter as a -viviparous female, without producing the soxiiol forms. The 

 aphis has the habit, when disturbed, of elevating the pjstoi'ior legs. The lit^ad 

 is du'cctwl upwards when at rest as in Stonwplds. 



Pterochlorus tropicalis van dtr Goit. 



(Host plants) 



Quercns dentala, Q. (jlanchiUfera, Q. sernda, Q. vminbiUs, Qucrcus sp])., 

 Caslniica vuly iris, etc. : the branches and twigs arc attacked. 



Bdida (lUxi : the branches or twigs am rarely attacked. A winged 

 %iviparous female was obsened producing young on June 12, 1917, and some 

 wingless ones were seen on Juh' 8, 1919 near Tokyo. 



(Season when the insect is abundtmt) 



Near Tokyo this insi;ct is abundant in the spring, most so is May, Init 

 its numbers are greatly reduced during the montlis of July and August. 



(Winged viviparous female) 



The first generation (stem-mother) consists only of wingless froms, but 

 each of the second and the following generations produce both winged and 

 wiii"le3s individuals. 



