.U'HIDID.E OF FORilOSA. 97 



Tlie ^^iugless form? jiro rather inactive, densely covered with a white 

 powder, and have the hiibit of ruoving the abdomen fi-om side to side when 

 distm'bed. 



(Dishibutiou) 



Formosa : Taihokn, Hokuto, Sozan, Kagi. 



•Japan : Tokyo. 



Aphis gossypii Glov. 



(Host plants) 



Acaatliopaimo: acvlcaium : many wingless and winged viviparous females 

 were ob^eiTed on June 24, July G and 29, and August 11, 1920, near 

 Taihoku. 



Coloc-asia onfiqiionim : near Taihoku the aphis is present on the lower 

 sides of the leaves at any season, but not producing a conspicuous infestation. 

 Tlie gi-eatest abimdauce on this plant is iu July or August. 



Dichrocephala latifoU" : not imcommom on this plant iu I\Iai-ch near 

 Tjiihoku. 



GnaplvAiv.m japoiikwa : a winged form on March 5, 19"21, and many 

 winged and wingless individuals on April 10, 1922, near- Taihoku. 



HiLiscus rosa-sinc-Hsis : sometimes occm-s in large numbere on the leaves 

 and flowei-s in Formosa, as well as iu Japan. 



Hibiscus oMinoscJivs : a few wingless viviparous females on November 25, 

 1921, near Taihoku. 



Hibiscus species : verj- comu;on iu November, near Taihoku. 



Jv.dicia procurahcns : some wingless and a winged viviparous ones on the 

 flowers on April 13, 1922, near Taihoku. 



Liquidarnlor formosam : the aphis is present on the lower sides of the 

 young leaves from the middle of Febnuuy to the beginning of April in For- 

 mosa, sometimes occmTLDg in great numbers in March. 



Popaver somni/erv.m : many individuals, lx)th winged and wingless, were 

 collected in Mai'ch 1918, at Kagi, Formosa. 



Pirus serotiiM .- the aphis is present on this plant fi-om February to July 

 near Taihoku, sometimes occurring iu large numbers on the lower sides of the 



