Aphididae of Formosa. — I. 35 



Body Dval, rather wide; hroadet^t at midlength of tlie alidomen, 

 witlu)Ut hairs. Head small and very short, with a few short slightly 

 capitate hairs. Ej-es small; ocular tubercles small. Frontal tubercles 

 short, with the inner side convex. Antennae short, imbricated, with- 

 out hairs; the 3rd joint without sensorir; ajiical sensorie of the oth 

 joint not large; the relative length of joints as follows: III — ~^9, lY — 

 28 \' — 25, VI — ■•38(17 + 41). Kostrum short, not reaching the middle 

 coxae. Protliorax with a small lateral tubercle. Cornicles imbricated, 

 a little longei' than the cauda, but not reaching the cauda, expanded at 

 the l>ase and slightly dilated at the apex. Cauda wedge-shoped, longer 

 than wide, with 3 pairs of very short lateral bristles. Legs slender, 

 with some setae. 



Length of body — 2.5 mm- .\ntenna — 1.4 mm. 



Cornicle — 0.35 mm. 



Winged viviparous female. 



Antennae, eyes and mesothorax black. Abdomen dirty yellow, 

 with many small grey patches and spots on the dorsum. Wings along 

 the veins slightly fuscous clouded; stigma and veins grey. Femora 

 black except the pale l>rown base, ti])iae pale brown, with the apices 

 l)lack: tarsi black. Caude blackish, paler at the base. Cornicles pale 

 l)lackish l)i'own. Body oblong, without hairs. Frontal tubercles very 

 short, slightly convex on the inner side. Antennae shoit, imbricated, 

 witliout hairs; the 3rd joint with about 30. the 4th 13, the 5th 1 

 sensoria irregularly scattered over the whole length ; the relative length 

 of joints as follows: III— 52, IV— 33, V— 28, VI— 67 (20 + 47). 

 Rostrum not reaching the middle coxae. The 3rd oblique of fore wings 

 twice forked, the 1st fork extending to the wing apex, the 2nd short; 

 hind wings with 2 obliques nearly parallel; booklets 3. Legs slender, 

 with some moderately long setae; tarsi .slender and imbricated. 

 Cornicles similar to those of the wingless females but shorter. Cauda 

 shorter than the cornicle, expanded on the l)asal half, with 2 pairs of 



