Aphididae of Formosa. — I. 21 



AlKlumeii orange yellow, with some small black spots on the 

 basal lialf of tiie dorsum, 4 black bands on the hind half, 4 ratlier 

 large black patches on eacli side in front of the cornicle and one large 

 black patch behind tlie base of the cornicle. 



Femora mostly Idack, witli the bases brownish: tibiae dark 

 brown, with tiie apices black; tarsi black. Stigma and veins gray. 



Body with many prominent capitate hairs. Frontal tubercles 

 conspicuous, much shorter than the 1st antennal joint, with the inner 

 side moderately convex. Antennae very long and slender, with some 

 moderately long cajaitate hairs; the 1st Joint much larger than the 

 2nd, with some capitate hairs; the 3rd joint with 20-23 circular 

 sensoria of rather small size almost in one I'ow over the whole length; 

 the 4th joint imbricated, with 12 sensoria of mostly small size in one 

 row over the whole length; the oth joint witli an apical sensoria; 

 the relative length of joints as follows: IlI-lOO, IV-84, V-85, 

 VI-115 (15+100). Rostrum slender, reaching the hind legs. 

 Cornicles very long and slender, reaching far beyond the caudal apex, 

 a little shorter than the 3rd antennal joint, cylindrical, broadest at the 

 base, very slightly tapering, imbricated, reticulated on the apical area. 



Wing-veins normal; hind wings with 2 parallel obliques: hook- 

 lets 5. Legs very long and slender, with many stout setae, some of 

 which are slightly knobbed. Cauda small, broadened at the basal 

 half, longer than wide, with 3 pairs of long lateral hairs. 



Length of Ixjdy — 2.7 nnn. Antenna — 3.7 mm. 



Fore wing — 4.5 mm. Cornicle — O.S mm. 



Hosts.- — Woodwardia spp.; Polydicum sp. 

 Distribution. — Formosa (Taihoku, Kwannonzan). 

 This plant louse is rather i-are near Taihoku, the winged form 

 occurring only in the winter. 



. Jli/zus poli/podiaclcola n. sp. (PL. H, 1. Figs. 1-5). 

 Wingless viviparous female. 



Yellow. Eyes, cornicles and cauda black. The 3rd antennal 

 joint yellowish brown, with the apex black; the 4th and the following 



