AriHDID.E OF FORMOSA. y3 



Myzus arthi'axonis Tiik.ih. 



(ri. J, A, ligs. 1— '2 .t ri. Vir, B. figs. 7—8) 



Ho.st plant. — Atiliraxon ciJiuris. The under surfaces of the Iea\-es aro 

 attacked. Same wingless viviparous feiaales and a few winged ones wert; 

 f<;iuud on March 6, 192J, near Taihoku. Not attended by ants. 



Capitophorus hippophaes (Koch). 



Hijst plants. — Pohj(jfiiiviii hipiihifdiuui aud Pohjijomua h>/ihripipri: 

 The lower surfaces of the loaves are attacked and the infested leaves are 

 slightly cru'led. Some wingless and winged vivipai'ous females were observed 

 on February 6 and May 20, 1922, near Taihoku. This aphis is very inactive 

 and does not gi'oup densely. Not attended hj ants. 



Capitophorus formosartemisiae Tak ah. 



(PI. VII, B, figs. 9—10) 



H(jst plant. — AdeiiuHla vuhjar'is var. indica. The under surfaces of the 

 leaves are attacked. A few wingles aud wiugel viviparous females were found 

 on March 13 and 15, 1921, near Taihoku. The species is very inactive iu 

 habit aud is not attended bj- ants. 



Trichosiphonaphis polygon! formosanus Takah. 



Host ^\&ut—Pul!i[i<miim 'pr)-f<Jlalnrii. The lower surfaces of the stalks 

 and leaves are attacked. 8L>me wingless viviparous females and nymphs of 

 the winged form were observed on October 25, 1920, near Taihoku, and 

 same wingless a.ud a few winged ones on March 20, 1921, at Kagi, Formosii. 



Trichosiphonaphis polygoniformosanus Takah ? 



An aplus feediug on the Ljwer surfiice of the leaves and stalks of Lonkcra 

 Japonica seems to be identical with T. pyrJijijoniforinrHamin Takah. feeding ou 

 the Poh/goinoii. Near Tailmku the aphis is very r.iro c:)u the Loidccra, s:.)me 



