4 04 s - MATSUMUkA 
46. Myzus sasakii n. sp. 
Aphis sp. ? Sasaki — Nippon-Jumoku-Gaichu-Hen Vol. II, p. 132 f. 
138 (1902). 
Winged viviparous female (migrants) — Body long oval, olivaceous yellow, 
mesonotum greenish brown ; antennae rough, distinctly shorter than the body, 
on the inner side of the first joint gibbously projected, the 2nd globular, the 
3rd subequal to the 4th and 5th combined, the 6th the longest, anterhinarial 
nearly 1/2 the length and 1/2 the breadch of the postrhinarial, the 3rd with 
about 28, the 4th with 9, the 5th with 5 roundish sensoria ; fore wings nearly 
twice the length of the body, hyaline, with a light fulvous tinge, veins ful- 
vous, stigma pale grayish, the 2nd furcal rather nearer the apex of the first ; 
abdomen broader than the thorax, at the apex strongly attenuated ; cornicles 
moderately long, imbricated, broader towards the bases, as broad as the pos- 
terior femora ; Cauda broadly conical, nearly twice as broad as the cornicles ; 
legs pale fulvous, femora at the apices deeper in color. 
Length of body 1.6 mm.; exp. tegm. 5.6 mm.; antennae 1.2 mm. 
Nymph — Differs from the winged females as follows : 
The antennal tubercles on the inner side gibbously projected and short 
pubescent, all the joints lacking sensoria; the wing-sheath reaches to the 2nd 
abdominal segment; cornicles somewhat shorter; cauda indistinct. 
Length of body 1.4 mm.; antennae 0.9 mm. 
Hab. — Honshu (Tokyo). 
F. P. — Prunus dominum ; collected by Prof. Chujiro Sasaki and kind- 
ly sent to me for identification. 
Nom . Jap. — Sakura-fushi-abura. 
Gall — Large, bag-shaped, somewhat compressed, brownish in color, with 
short petiole, made on the upper surface of the leaf ; when the gall matures 
an exit is made on the under surface of the leaf, from which the alated female 
flies off. 
It is a common fact that the species belonging to this genus sometimes 
produce pseudogalls. but this insect builds nearly a true gall. I have ex- 
