Aphididafi of Formosa. — 3. 95 



such groups; these groups of wax-pores transversely oval or narrowed in shape. 

 Cornicles represented almost as more pores. Cauda much wider tlian long, rounded, 

 not constricted at the liase, without hairs. Anal plate not bilobed. Legs rather 

 sliort, almost as stout as, or a little more slender than, the antenna, provided with 

 but 2 or 3 very long liristlcs near tiie apices of tibiae; tarsi very sliort, sliortcr than 

 the 4th antennal joint, provided with a few very long bristles. 



Length of body-about 1.0 mm. Antouna-about 0.5 mm. 



Nymph [the first instar) of winged viviparous female. 

 Yellow. Eyes almost black. Antennae slightly dusky. Legs almost colourless. 

 Body oval, almost 2.8 times as long as the antenna, rather ilat, without hairs, 

 covered with some wliite secretions; the segments not well-defined. Wax-pores 

 well-developed, numerous, circular, very small and of the same size, distributed 

 almost as in the grown nymph of the winged form. Head fused with the prothoax. 

 Eyes very small, composed of 3 facets. Antennae not stout, more slender than the 

 leg, 3 or 4-jointcd, imbricated; the 1st joint almost as large as the 2nd, provided 

 with a moderately long bristle; tiie 3rd almost as long as, or very slightly longer 

 than, the 4th, with a very small apical sensor ium, without hairs, the 4th almost as 

 long as the basal two jonts taken together, with a few very long bristles at the tip. 

 Rostrum reaching a little beyond the middle coxae. Cornicles absent. Cauda not 

 visible. Anal plate not bilolicd. Legs comparatively large, stout, tibiae slightly 

 imlticated, with a few moderately long bristles at the tip; hind tibiae a little shorter 

 than the 3rd and 4th antennal joints taken togetlier; tarsi provided with some very 

 long liairs. 



Length of body-about 0.4 mm. 



The antennae of the 2nd and the following instara (winged form) are very 

 stout, somewhat curved, not imbricated, and are ''-jointed, altliough the joints are not 

 well defined. 



Nymph of wingless viviparous female. 

 (The first instar) Differs from tlie nympli (the 1st instar) of the winged 

 form in the following characters: 



(1) Antennae somewhat shorter, usually 3-jointed; the 3rd joint about 2.5 

 times as long ae the basal two joints taken together. 



(2) Body provided with many rather large, somewhat protuberant circular 

 wax-pores arranged in a single row along the whole margin of the body, but not on 

 the dorsum. Wax horizontally protruding from each pore on the margin of the 

 body and elongate in shape. 



