52 K. Takahashi. 



hut differs t'runi the latter in the structure of the antennae, tlie colour 

 (if the body, etc. 



Aphis droserae is found on the flower or the underside of the leaf 

 of Di-osera lourell a well known insectivoj'ous plant in Japan. 



Aphis bambusae Fullaway. (PL. xii, 2, figs. 5-0) 

 Aphis bambusae, FuUaway, Ann. Kept. Hawaii Agr. Expt. St. p. 

 35 (1910). 



Melanaphis. bambusae, van der Goot, ( 'ontril). Fauna Indes Neer- 

 land. i, iii, p. 01 (11)17). 



Host. — Bambusa nana. 

 Distribution. — Formosa (Tailioku). 



Hawaii (Fullaway); Java (v.d.G.); Singapore (v.d.G.); 

 Hongkong (v.d.G.) 

 Hitherto unrecorded from Japan. 



This species is rather rare near Taihoku and I have never collected 

 the winged females. 



Aphis nasturtii Koch.? 



Die Pflanzenl. p. 136 (1857). 



Wingless viviparous female. 



Dark green, slightly covered with a white powder. Body oval, 

 almost lacking liairs. Frt)ntal tubercles very sliort, somewhat convex 

 on the inner side. Antennae 4 or 5-jointe<l. imbricated, lacking 

 hairs: the 3rd joint lacking sensoria; the relative length of joints as 

 follows: HI— 14, IV— 10, V— 11. VI— 28 (8 + 20). Rostrum reaching 

 beyond the middle coxae. Prothorax and the 1st and 7th abdominal 

 segments with a small lateral tubercle. Cornicles very short, stout, 

 not reaching the caudal base, imbricated, broadest at the base, very 

 slightly narrowed at the midd^le portion, about 2 times as long as wide 

 at the base, Cauda a little longer and wider than the cornicle, con- 

 stricted about the middle, with 3 pairs of lateral long bristles. 



