76 llYOIcril TAK.VUASill: 



It is \i\ip;u'ous :ill the year like most Aphididic in Formosa, aud no sexes 

 liavo been observed. 



(Intermediate) 



No iutormediates liave been found. 



(Colour variation) 



Some yellowish wingless individuals were noticed in August, 1921. 



(Habit) 



It has the; habit, oven when slightly disturbed, of dropping to the gi'ound. 

 The Lead is directed downwards wlien at rest. 



(Communal life) 



Tliis sixicies aud Slacrosiphoniella formosaiiemisicB Takab. or Cerosiplut sp. 

 are sometimes fijund in groups on the host. Not attended by ant?. 



(Distribution) 



Formosa : Taihjku, Shiriu. 



Macrosiphoniella citricola van der Goot. 

 (ri. I, A, figs. 5—7 k ri. 11, A, fig. o) 



(Host plants) 



Laisiuuthm spcci-s : the lower surfiices of the leaves and young shoots are 

 attacked, the infested leaves b.>ing curled. The author observed on tliis plant, 

 some wingless and winged viviparous females on April 8, 1921, at Urai, aud 

 a few \vingless ones on July 18, 1921, at Kappanziiu, Formosa. 



Cinnamoimun campliora : the lower surfiices of the young leaves are at- 

 tacked ; the infest<xl loa\es do not curl. Some wingless viviparous females 

 were observed on this plant ou March 3, 1922, at Taihoku. 



Ficus ol)scura : one wingless form was found on the lower side of a young 

 leaf on Aj ril 17, 1922, at Tailioku. 



Biiddia ovahi : many wingless aud a few winged viviparous females were 

 obsen-ed ou the young shoots and the under surface of the leaves on April 3, 

 1922, at Maruyama, near Taihoku. 



Murraija exotica : a few wingless viviparous females were found ou the 

 young leaves on April 21, 1922, at Taihoku. 



In Formosji this aphis has never been collected on Citrus. 



