Apliidiilae of Formosa.— 3. 7 



tlie fore pads in the fourtli iiii3tar. 



The legs are sliortcr and stouter tlian in the adults, with tlie tarsi 2-jointed 

 and furnished with two claws. The first (arsal joint is smaller than the second, as in 

 tlip adults. In some Callipterina, the limpid cmpodial hairs are present even in tlie 

 young nymplis, as in the grown nymphs and adults. Even in the youmg nymphs, 

 certain Hormaphidina are furnished witli some V(u-y long capitate liairs on the tarsi 

 which are sometimes imbricated. 



In FeriphyUm. the hind pair of tibiae is provided with some bristles arranged 

 nearly in a single row in the young nymphs, but with these much numerous and 

 not in a single row in the grown ones. Tiie front and middle paii'S of tibiae of the 

 dimorphs are not provided with normal hairs, but with lamellae. 



Tlie abdomen becomes larger, as the growtli proceeds. The hit(!ral tubercles 

 are visible even in the first instar in hhopah.sqjhum and ^IjiJu's. while tlu' dorsal 

 ones, which are very prominent in the winged adults, are not recognizable in the 

 nymphal stages in MyzocaUis pscudnahii Takah. or in CaUijAerus kahaimJunlrtJani 

 Kirk. In Cervaphu, the abdomen, as well as the head and thorax, is provided 

 with long projections, which are branched in the grown nymphs, as well as in the 

 adults, but not in tlie first instar. CavarieUa is furnished with a tubercle above 

 the Cauda much shorter than that of the adult, even in the first instar, while in 

 Green-idea eacli of the seventh and eighth abdominal segments of the first instar is 

 armed with a pair of tubercles which entirely disappear with the first moult. 



The dorsal tubercles on the seventh and eighth abdominal segments of the 

 genus AMaia are very distinct even in the young nymphs, being as large as or 

 larger than tliose of the adults. SetapMs viridifi v. d. Goot is furnished with a pair 

 of sharply pointed horns on the abdomen as in tlie adults. 



The cornicles are shorter, stouter and less -imbricated than in the adults, never 

 being reticulated, and are markedly shorter in tlie younger instars. In Amphoro- 

 phora the cornicles are less dilated in the young nymphs than in the grown ones or 

 adults. IiJwpcdosiphum nymphaeae L. possesses somewhat dilated cornicles even in 

 the first instar. The cornicles of the nymplis are almost similar in shape,but usually 

 smaller than tliose of the adults in Ald-aia, Lachnina, some Callipterina and 

 Hormaphidina and others. But in Ohromaphis earplnicoJa Takah., the cornicles of 

 the fully-grown nymphs arc; larger than those of the winged adults. In DUachnus, 

 Lnrhnus and FterocJdortis-, the cornicles are situated on the cones which are shorter 

 tlian those of tlie grown nymphs and are entirely or nearly destitute of hairs in the 



