APHIDID.E. 257 



become, as far as possible, well acquainted with the structural details 

 of the systematic student. 



As regards terms for the family or sub-families, Buckton says — 

 " The Aphides have the following synonyms : 

 Aphides, Linntieus. 

 Aphidce, Curtis, West wood. 

 Aphidina, Burmeister, Walker, Hartig. 

 Aphidinw, Rondani. 

 AjjiMdida^, Passerini. 

 It is therefore rather difficult to know what precise term to adopt for 

 the family or sub-family." 



The family APHIDIDiE may bo divided into six tribes — viz., 

 Aphidinae, Lachninse, Schizoneurinse, Pemphiginse, Chermesinae, 

 and Rhizobinse. 



The following are the principal tribes and genera which are arboreal 

 in their habits : — 



Tribe Aphidinae. — Upper wings with cubital vein twice forked ; 

 lower wing with two oblique veins. Antennse long, with seven 

 joints : 7th joint long, 3rd usually longest. 



The following are the principal genera belonging to this tribe 

 which are arboreal in their habits — 



Myzus. Aphis. 



Drepanosiphum. Chaitophorus. 



Melaxoxanthus. Callipterus. 



Tribe Lachninae (woolly). — Wings same as in Aphidinae. Antennae 

 six joints, 7tli rudimentary. Genera — 



Pterocallis. Stomaphis. 



Phyllaphis. Dryobius.^ 



Lachnus. 

 Tribe Schizoneurinae. — Upper wing, cubital vein once forked ; 

 lower wing with two oblique veins. Antennae six joints, 7th rudi- 

 mentary ; 3rd ringed, 4th often ringed. Genus— 

 Schizoneura. 

 Tribe Pemphiginae (gall-forming). — Upper wing, cubital vein not 

 forked ; lower wing with one or two oblique veins. Antenna.^ short, 

 six joints ; 7th rudimentary. Genera — 



Pemphigus. Tetraneura. 



' The above is adapted from Buckton, as it is rather ditBcult to reconcile his 

 classification : see vol. i. p. 94 and vol. iii. p. 11. 



