Aphidiae of Foiuinsa. — I. 63 



inconvenienced by this circumstance, but are to all appearances as 

 comfortable as those above water. 



This aphis on account of the waxy powder covering the liody 

 appears to be particularly adapted to a life in moist localities and to 

 suffer no inconvenience from contact witli water when submerged. 



Tribe Tnchodphhut. 

 Key to subtribes. 



(1) Wingless females with many elongate, branched projections. 



^uhtrihe Cervaphidinl. 



Wingless females without bi'ant-bed pi'djections 



Subtribe TrichosiphinL 



Subtribe Trichosiphini. 



(1) Antennae G-jointed Greenidea Schout. 



Antennae 5-jointed U utrichosiphum Essig et Kuw. 



Key to Formosan species of Greenidea. 

 \A'i!igless viviparous female. 



(1) .3rd antennal joint longer than spur ( •"> ) 



ord antennal joint shorter than spur (2) 



(2) Dark lirown or yellowish brown. Cornicles rather stout, not 



conspicuousl}' elongate G. Jicicola n. ^p. 



Greenish yellow. Cornicles slender and very long 



G. quercifoliae n. sp. 



(3) Caudal segment witliout a process (4) 



Caudal segment with a process (o) 



(4) Yellow, without a black patcli on the dorsum 



G. taiwdua n. sp. 



Pale yellow, with tlie dorsum of abdomen l)lackish 



G. nigrofasciatum (^\ak\). 



