Aphididae of Formosa. — I. "" 



slender, with some short hairs; eacli tarsal joint provided with 1^ long 

 capitate hairs; the 2nd tarsus more than thrice as long as the 1st. 

 Length of body — 1.7 mm. Antenna — 0.65 mm. 

 Fore wing — •J.linnn. Width of fore wing — 1.15mm. 



Host. — Bambusaspp., attacking the leaf. 



Distribution. — Formosa (Taihoku). 



Tliis beautiful aphis is very abundant in Taihoku in the spring 

 and winter, liut in the summer it is quite rare. 



Tlie winged forms appear from April to May. 



The wingless viviparous female lias well developed waxglands of 

 " 'msularis-\.j])e " on the sides of the thoracic and abdominal segments. 

 Each group is composed of -Jt-ti small circular waxglands which are 

 sometimes slightly narrowed transversely. 



In Oregma bambucicola Takah. the waxglands are not well 

 developed. 



Oregma bambucicola n. sj7. 



(PL. viii, 1, fig. 11 & PL. viii, 2, figs. 1-5) 



Wingluss viviparous female. 



Dark purple. Head yellowisli brown. Eyes black. Antennae 

 pale brown, with tlie apex black. Legs yellowish brown, the tarsi 

 black. Cauda paler. 



Body soft, oval, conspicuously convex, furnished with many 

 moderately long fine hairs; not or l)ut slightly covered with waxy 

 secretions on the sides and dorsum; a little powder on the underside 

 of the body. 



Head fused with the prothorax. Head and pronotum with 

 numerous minute pores; mesontnni with 4 large groups of minut pores; 

 dorsum of tlie abdomen with some small groups of minute pores. 

 Tubercles on the head large, as long as or longer than the 1st 

 antennal jt^int, somewhat curved upwards, somewhat expanded 



