206 PROC. ENT. SOC. WASH., VOL. 24, NO. 7-8, OCT.-NOV., 1922 



Winged viviparous female. Body lacking hairs. Head provided with a few 

 normal hairs. Frontal tubercles very short, somewhat convex on the inner 

 side. Antennae imbricated, lacking hairs; the 1st joint almost straight on the 

 inner side; the 3d joint' provided with about 45 very small circular sensoria 

 scattered over the whole length; the 4th joint provided with 18 similar sensoria; 

 the 5th joint provided with about 8 sensoria almost in a row, the apical sensoria 

 larger; the relative length of joints as follows: 111-61, IV-37, V-32, VI-91 

 (13 + 78). Rostrum reaching the middle legs. Fore wings with the 3d oblique 

 twice forked; subcosta provided with about 10 small circular sensoria on the 

 distal half; stigmatic vein not strongly curved; hind wings with one oblique, 

 hooklets 4, wing veins rather stout. Cornicles cylindrical, imbricated, very 

 slightly dilated on the basal and apical portions, 25 times as long as the cauda, 

 reaching almost to its base, 6 times as long as wide, provided with some moderately 

 long hairs which are not knobbed. Cauda short, stout, broadened on the 

 basal half, longer than wide, provided with 2 pairs of lateral bristles near the 

 apex. Legs long and slender, provided with many setae; tarsi rather slender; 

 hind tarsi as long as the cauda. Length of body, about 1.8 mm.; cornicle, 

 0.3 mm.; antenna, about 1.8 mm.; fore wing, 2.5 mm. 



Host. Polygonum perfo/iatus, attacking the leaf and the stem. 

 Hab. Formosa (Taihoku, Kagi); Japan (Tokyo). 



Actual date of publication, November 18, 1922. 



