Aphididae of Formosa. — 3. 67 



apicos ol tibiae aud the tarsi dusky; middle and hind femora dusky, with the bases 

 pale brownish; middle tibiae pale brown, with the apices and the tarsi dusky; hind 

 tibiae dusky yellowish, with the tarsi dusky. Body oblong, slightly covered with 

 a powder, provided with some long I airs. Head with some extensive groups of 

 small wax-pores on the dorsal surface. Antennae with a few hairs; the 4th joint 

 slightly imbricated; the 3rd joint without sensoria; the relative length of joints as 

 follows: III-60, IV -30, V-35, VI-35 (29+6). Rostrum nearly reaching the middle 

 coxae. Pronotum with 6 groups of small wax-pores. Meso-and metanota and each 

 abdominal segment with fonr groups of very small wax-pores on the dorsum. 



Each group of wax-pores with a long bristle arising from the center of it. 

 Cornicles almost as in tlie viviparous form. Cauda not narrowed at the base. 

 Anal plate not bilobed, rounded. Legs with some bristles; hind tibiae somewhat 

 swollen, somewhat stouter than the fore and middle tibiae, provided with about 30 

 rather large sensoria, which are irregular in shape, mostly on the basal half; hind 

 tarai almost as long as the 5th antennal joint. 



Length of body-about 1.8 mm. Antenna-about 0.87 mm. 



Winged male. 



Body narrow. Head provided with groups of wax-pores arranged on the 

 dorsum; tiiese groups of wax-pores almost as large as, or a little larger than, the 

 simple eye, with a long bristle arising from the center of each. Eyes very large, 

 with distinct ocular tubercles. Frontal tubercles very short. Antennae with a few 

 hairs; the 3rd joint provided with about 18 large oval sensoria distributed over the 

 whole length in a single row; the 4th somewhat imbricated, with 5-8 circular 

 sensoria; the 5th with 6 similar sensoria, the apical one large; the 6th with about 3 

 similar sensoria in a row near the base; the relative length of joints as follows: 

 ni-80, IV-43, V-45, VI-37 (32+5). Wax-pores present in groups on the dorsum 

 of the thorax. Abdominal segments with 4 groups of wax-pores on the dorsum. 

 These groups of wax-pores with a long bristle arising from the center of each. 

 Cornicles almost as in the female. Cauda moderately constricted near the base. 

 Anal plate slightly sinuated. 



Length of body-about 1.3 mm. Antenna-about 1.1 mm. 



Some oviparous females and a few males were observed on the leaves of an 

 old (Ji'Jtis, in Detember, 1922, and in January, 1923, when some viviparous females 

 were also observed on the same host. 



Nymph of viviparous female. 



