4 R. Takaluishi. 



(.")). Antennal Sensoria often annular; winged form not provided with 



many hairs; cornicles very short or often absent 



Tribe Pemfliiglna. 



Antonnal sensoria circular or oval; winged form provided with 

 many hairs; cornicles short, often situated on hairj' cones. 

 Tribe Lochnina. 



Tribe Aphidina. 

 Ke}' to suiitril)es. 



(1) Top of head forming a ledge which extends out over the 



antennae Subtribe Vesiculaphidini. 



Top of head not forming a ledge (2) 



(2) Head without prominent frontal tubercles... '^uhtrihe Aphidini. 

 Head with prominent frontal tubercles (8) 



(3) Stigmatic vein strongly curved or more or less united with 



the upper branch of the 3rd oblique 



Sul)tribe Penlalanini. 



Stigmatic vein normal Subtribe il/rcros/p/w/tt. 



Subtrile Macrosiphini. 



(!) Cornicles cjdindrical or tapering, scarcely swollen (2) 



Cornicles swollen Aviphorophora^Vkcki. 



(2) Frontal tubercles with a prominent projection.... Phorodon Pass. 

 Frontal tubercles without such a projection (•"!) 



(0) Frontal tubercles strongly convex on the inner side. ... J/ysw.s Pass. 

 Frontal tubercles not strongly convex on the inner side (4) 



(4) Cornicles as long as or shorter than the Cauda 



3IacrosiphonieUa Del Quel. 



Cornicles longer tlian the cauda Jlacrosip/nivi Puss. 



Key to species of Macrosiphum. 



(1) Wingless females provided witli numerous sensoria scattered over 

 tile 3rd antennal joint (2) 



