Aphididae of Formofa. — I. 87 



Wingless viviparous females slightly covered with a powder. ( 3 ) 

 (3) Green. Winged females with 35-40 annulations on the 3rd 



antennal joint 0. bamlmcifoliac n. sp. 



Not Green. Winged females witli 23 annulations on the 3rd 

 antennal joint O. panicola n. sp. 



Oregma lanigera (Zehnt.) (PL. XII. 2, figs. 1-4). 



Ceratovacuna lanigera, Zehntner, Arch, voor de Java-Suikerin- 

 dustrie, V, p. 553 (1897): Matsumura, Die schiid. Nutz. Zuck Ins. 

 Formosa p. 12, pi. ix, fig. 3 (11)10). 



Ccrataphis succ/iarirora, Matsumura, Essays for Nawa, p. 57, pi. xi. 

 fig. 6 (1017). 



Oregma lanigera, van der Qoot, Contrili. Fauna Indes-Neerhmd. I, 

 3. p. 190 (1917). 



Host. — Saccharum officinarnm: 3Iiscanthus spp. 



Distribution. — Formo,sa (Tailioku. Tainan, Ako, Taichyu). 

 Java; Ceylon (Schouteden). 



This aphis is one of the most important injurious insects in our 

 island. The winged viviparous females can be seen at almost all times 

 and no sexuales occur through the ye;i]'. 



l)r. Matsumura's species is undoubtedlj^ a synonym of 0. lanigera 

 (Zehnt. j 



Oregma bambucifoliae n. sp. (PL. viii, 1, figs. 1-10). 

 Wingless viviparous female. 



Bod}' yellowish green or fresh green, with a pair of longitudinal 

 dark green patches on the dorsum, which are often interrupted at mid- 

 length. Eyes black. Antennae and legs pale green or white. Body soft, 

 broad, flat, only slightly convex; sparsely covered witli a white 

 secretion on the dorsum and provided with a few long liairs. Head 

 small, not separated from the prothorax; horns finger-like, not 

 pointed, nearly as long as the 2 basal antennal joints taken together. 



