Aphlcliilap nf Formosa. — 3. 



9 



aphidiiia. In Oreijma bamhusifoliae Takah., as well as in 0. hinnhusicola Takah,, 

 the wax-pores of all the instars of botli the winged and wingless forma scarcely differ 

 from those of the apterous adults in nuniljer, shape and distribution, but in some 

 other species they differ distinctly. In Oregma panicola Takah., the wax pores arc 

 very small, and scattered over the head and thorax, being absent on the abdomen 

 in the grown nymphs of the winged form, while they are larger, circular and distri- 

 buted as in Oregma montaim v. d. Goot in the nymphs of the wingless form. In 

 Astegnpteryx and some species of Rormaphidina, tlie nyniplis of the apterous form 

 have many wax-pores arranged in a single row around the whole margin of tlie 

 body, while those of the winged form possess much more wax-pores in tjroups on the 

 dorsum, throughout all the instars. 



Number of the antennal joints. 



In giving tlie number of joints of the antennae, the author, of course, has not 

 counted the filament or spur of the last joint as a separate and distinct 'oint. 

 (Abbreviations used in the following table) 



A. V. $ — Apterous viviparous female. 



F. Fundatrix or stem-mother. 



O. $ — Oviparous female. 



W. V. ^ —Winged viviparous female. 



V. § — Viviparous female, both winged and wingless. 



