Aphididae of Formosa. — I. 59' 



Length of body — 1. 15 mm. Antenna — 0.75 mm. 



Cornicle — 0.2 mm. 



Winged viviparous female. 



Yellow. Antennae pale yellow, with the apice.s of joints dusky. 

 Eyes blackish red. Head and mesothorax dusky. Wings hyaline; 

 stigma pale yellow, veins brown. Cornicles and cauda yellow. Legs 

 pale yellow; apices of tilnae, and tlie tarsi dusky. Body with a few 

 very short hairs. Frontal tubercles lacking. Eyes normal. An- 

 tennae well imbricated, without hairs, 6-jointed; the 3rd joint with 

 4-6 sensoria in a row; the 4th joint lacking -sensoria; the relative 

 length of joints as follows: 111-24, lV-13, V-14. VI-40 (10 + 30). 

 Rostrum stout, reaching a little beyond the hind legs. Prothorax and 

 the 1st and 7th abdominal segments with a small, blunt lateral 

 tubercle. JMesothoi'ax with a short, blunt lateral tubercle which is 

 larger than that on the prothorax. The 3rd oblique twice forked; 

 hind wings with 2 ]);n'allul ()l)liques; booklets 2. Cornicles short, 

 stout, imbricated, not reaching the cauda, somewhat tapering. 



Cauda large, a little shorter than the cornicle, with 4 pairs of long, 

 lateral bristles. Legs slender with some small setae. 



Length of body — U. 7 nun. Antenna — 0. 7 mm. 



Fore wing — 1.3 nnn. Width of fore wing — 0.45 mm. 



Host. — llelastoma candldum. 



Distribution. — Formosa (Taihoku); Malay (Jahore). 



The winged females appear in the autumn and winter. I 

 collected dark green individuals in December 1920 and Januaiy 1921. 



Anur aphis helichrysl Kalt. (PL. xiii, 2, tigs. 7-9). 



Aphis helichrysi, Kaltenbach, Monog. Pflanz. (1843). 

 Aphis myosotidis, Koch, Fdanz. p. 57 (1857). 



Aphis pruni, Koch, Pflanz. p. GiS (]857); Buckton, Monog. Brit- 

 Aphid. 11, p. 64 (1877). 



