Aphididae of Formosa. — I. 65 



on the apical portiun. Cauda with a process. Anal plate sometimes 

 slightly sinuated at the middle of the posterior margin, fm-nished with 

 many long bristles. Legs slender, with many long or moderatel3" long 

 stout setae. 



Length of body — 1.8 mm. Antenna — 1.9 mm. 



Cornicle — 0. 8 mm. 

 Host. — Quercus variabilis. 

 Distribution. — Formosa (Taihoku). 

 Collected by the author. 



Greenidea formosanum (Maki.) 



Trichosiphtim formosanum ^ak\. Collect. Essays for Nawa, p. 13, 

 pis. viii-ix, 1. 2(1917). 



i&m-^m MmMmn no. i38, p. 340 (i9i8). 



Hosts. — Psidivm guyava. 



Distribution. — Formosa (Taihoku, Shirin, Shinten, Urai, Koheki, 

 Kanshirei, Koshyun). 



Oreenidea nigrum (Maki.) 



Trichosiphum nigrum. Maki. Collect. Essays for Nawa, p. 10, 



pi. vii (1917). 

 ^im% »^a*^ No. 138, p. 338 (1918). 

 Host. — Quercvs sp. 

 Distribution. — Formosa (Taihoku). 



Oreenidea nigrofasciatum (Maki.) 



Trichosiphum nigrofasciatum Maki. Collect. Essays for Nawa, 

 ]). 16, pi. ix, 3-7 (1917). 



^imn> mm&mm. no. i38, p. 342 (19 is). 



Hosts. — Quercus spp. 

 Distribution. — Formosa. 



