144 KYOICIII TAKAIIASIU: 



S3X0S have never bixni ubsc^rvetl. 



(Intei'mcxliiit*-) 



No interm(!(li,itx« have beeu coUockd. 



(Habit) 



Tin's apliLs is foiiuil j;iMiipiiig, tluiigli uot densjlv, od thi> lower surface, 

 especially along the iiii(Wbs, of the leaves, with the head du'ected tj all 

 direetions. TJio wingless form h;\s the habit of moving the abdomen fi-om side 

 to side i\]ieu xory slightly, though uot strougl^-, disturbed. 



(Disti-ibution) 



loiTuosa: Taihuku, Shiriu, Kagi. 



Oregma montana v. d. Goot. 



Bamhitsa nana .- two or three winged and many wingless viviparous females 

 ^\■em obseiTed grouping at the bases of the lower surfaces of the leaves ou 

 Oct)lH'r -2, 1921, at Trai, ronnosa. 



Bamlitsa Nh-notitachtja : a few wmged and wiuglt^ss vivipiirous forms were 

 observed ou the young shoots and leaves, near Taihoku, in Oetolier and Kovem- 

 l)er, 1920 and 1921. 



TliLS aphis is rpiitc! r.ire neai' Taihoku, occurring in very small numlwrs. 



Oregma orientalis Takah. 



Host plant. — Arthmxon ciltaris ; the lower sides of tlic leaves are attacked. 



A fi'w wingle-ss vivip.arous females Avere oljserved grouping deusi?ly ou the 

 basal parts of the leaves, the head directed toward the base, ou July 2, 1920, 

 near Taihoku. 



Oregma panicola Takah. 

 (PI. IX, A, fjgs. 1— (J) 



Host lAimt—Panicum pakns ; attickiug tli(! stalk. 



^[■my wingless and winged viviparous females were o]>s»nTed ou iXcemljer 

 11, 192 \ near Taihoku ; ou January 3, 1921, and Jammy 1, 1922, at Unu ; 

 and some wingless ones ou Ajn-il ',\, 1921, at I'l'ai. Formosa. 



