94 B. Takahashi 



Head not fused witli the prothorax, provided with many vei-y short setae ou 

 the front, without Iiorns. Eyes large, with ocular tubercles. Antennae short, stout, 

 somewhat curved, 5-jointed, not imbricated, with a few bristles; the 4th joint with 

 a very small apical sensorium; the relative length of joints as follows: III-38, IV- 

 17, V-25. Ixostrum short, not reaching the middle coxae. Tliorax and alidomen 

 with a, few moderately long bristles. Cornicles very sliort, mucli wider than long, 

 scarcely on cones. Cauda short and stout, not constricted. Anal plate not bilobed. 

 Femora somewhat stouter than the antenna; tibiae a little more slender than the 

 antenna, i^rovided with many rather long bristles; hind tibiae almost as long as or 

 slightly longer than the antenna; hind tarsi somewhat longer than the 4th antennal 

 joint. 



Length of body-about 1.3 mm. 



Astegopteryx quercicola Takali. 



(PL IV, A, tigs. G-11 and PI. IV, B, tigs. 1-3 and PI. V, A, figs. G-7). 



Aphididae of Fosmosa-1, p. 93 (1921) and ibid.-2, p. 147 (1923). 

 Nymph of viviparous female. 



In the winged form four nymx^hal instars are distinguished, as in many species 

 of Apliididae, but in the wingless form only three nymphal instars are to be found. 

 Full-groM'n nymph of winged viviparous female. 



Orange yellow. Eyes dark reddish brown. Antennae and legs dusky. 

 ^Ving-pads pale yellow. Cauda yellow. Body somewhat flat, soft, lacking hairs, 

 densely covered with wliito cottony secretions. Wax-pores well developed, protu- 

 berant, circular, of medium or very small size; these pores in a group quite nume- 

 rous, those in tiie center of the group mucli larger. Eyes not distinct, nor protu- 

 berant, composed of about 17 facets, of which 3 are much larger. Head ratlier small, 

 almost fused witli tlie prothorax, tlie dorsal surface provided with large groups of 

 wax-pores arranged in two pairs, of which the hind pair is much larger. Antennae 

 very stout, somewhat curved, without hairs; 5-jointed; the 4th joint with an extre- 

 mely minute sensorium at the ti\); tlie 5th furnished with a few long bristles at the 

 apex; the relative length of joints as follows: III-45, IV-20, V-28. Rostrum very 

 short, reaching the front coxae. Pronotum on the dorsum provided with 4 large 

 groups of wax-pores, of which the outer ones are quite large, the largest of the groups 

 of wax-pores on the body. Mesothorax larger than other thoracic segments. Meso- 

 and iiietatlioraces and each abdominal segment (1-5) provided with 4 large groups 

 of wax-pores on the dorsum, but the Cth and 7th abdominal segments eaeJi with 3 



