AriIIDm.E OF FORMOSA. 39 



FuUawayella formosana Takali. 



(Host plants) 



AVhnn Jisfulosum ; AUiuni scorodoprastim vav vlvipirurii. Tliis iipLiis 

 sometime? occurs iu large uunibors, cloiug some injury to tlio leaves. 



(Season wlieu the insect is abuudant) 



The greatest abundance on the Allium fistulosmn seems to bo iu January 

 and February, since tlio species has l)eeu observed iu eucjmorous uumljers ou 

 this plant in tljese mouths. 



(Winged vivij)arous female) 



The winged forms are very commou. 



(Male and oviparous female) 



Near Taihoku it is continuously viviparous throughout tlie year, no sexes 

 having beou ob.srved. 



(Intermediate) 



No intermediates Iiavo Ijeeu observed. 



(Habit) 



The females are rather inactive, wheu at rest the chrectiou of the heads 

 being rather various. They do not move the posterior pair <if legs, but have 

 the habit of dropping to the ground, wheu disturlied, Not attended by auts. 



(Distiibutiou) 



Formosa: Taihokn, Shinteu, Toyeu. 



Pentalonia nigronervosa Coq. 



{V\. Vn, A, ligs. G— 9). 



(Host pLmts) 



Mma spp. : the inner sm-faces of tlio young leaves are attacked. This 

 insect does not cause serious damage. 



Alpinia spcciosa : the yoimg shoots ai-o attacked. Some wingless 

 viviparous females and nymphs of the winged form have been collected ou 

 Octoljer 24, 1921, at Kwansliirei, Formosa, and on July 20, 1922, near 

 Taihuku. 



(Season wheu the insect is abundant) 



