A REVISION OF THE TRIBE MACROSIPHINI OF JAPAN (HOMOPTERA : APHIDIDAE, APHIDINAE)

Tribe MacrosiphiniThe Aphidinae are divided into 2 tribes, Macrosiphini and Aphidini.The Macrosiphini are distinguished from the Aphidini in having the 1st and 2nd abdominal spiracles situated closely to each other and by the 1st and 7th abdominal segments wanting marginal tubercles; if the marginal tubercles are pre;.enton the 1st abdominal segment, then they are placed much dorsally to the spiracles.In the course of the present study have been known to occur in Japan 74 genera, which may be distinguished by the following key.Key to the genera 1* 1 Siphunculus reticulated at apex. . . .Key II Siphunculus not reticulated at apex. . . . . . . 2 2 (1) Cauda broadly round or semicircular. . .Key III Cauda conical, tongue-shaped or pentagonal. . . . 3 3 (2) Prothorax with 4 setae dorso-mesially. . . .Key IV Pro thorax with 2 setae dorso-mesially or with many dorsal setae arranged irregularly. . . 4 4 (3) Antennal tubercles undeveloped, if developed then median tubercle of head conspicuous, about as high as antenna I tubercles. . . . . . . . . . . . . .

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