82 



R. Takahashi. 



wings nearly parallel; booklets o: the ;5r(l oblique on the fore wing 

 only once forked. Cornicles long and slender, reacliing the cauda. 

 somewhat dilated near tlie apex, somewhat imbricated. Cauda 

 wedge-shaped, not i^harply pointed, projecting a little beyond the anal 

 plate, provided witli 2 pairs of rather short fine liairs. Anal plate 

 similar to that uf the wingless female. Legs slender, moderately long; 

 with a few setae. 



Length of body — 1.7 mm. Antenna — l.i'min. 

 Cornicle — 0.3 mm. Fore wing — 2.55 mm. 



Width of fore wing — 1. 15 n)m. 

 Host. — Cypervs rotundus. Collected by Mr. M. Maki. 

 Distribution. — Formosa (Taihoku). 



Hawaii (Fullaway). 

 The specimens described above slightly differs from Fullaway' s 

 specimens in having more sensoria on the antennae. 



Subtribe Aphidini. 



(1) . Cornicles very short, alnuist wilier than long. (9) 



Cornicles not very short, longer tlian wide (2) 



(2) Cornicles swollen, not cylindrical (3) 



Cornicles scarcely swollen, cylindrical or tapering (7) 



(3) Abdomen above the cauda with a projection. Cnvariella Del Ouer. 

 Abdomen above the cauda without a projection ( 4 ) 



(4) Antennae 5-jointed Yamataphis ^^aXs. 



Antennae 6-joinled (5) 



(5) Cornicles longer than the Cauda L' hoj^loslphum Koch. 



Cornicles as long as or shorter than the cauda ( (J ) 



(6) Cauda short and abruptly conical Brevicoryne Das. 



Cauda long, not abruptly conical Nyalopterus Koch. 



(7) The 3rd oblique once forked. .... Toxoptera Koch. 



The 3rd oblique twice forked ( 'S ) 



