296 FOREST ENTOMOLOGY. 



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

 of the systematic student. 



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

 " The Aphides have the following synonyms : 

 Aphides, Linnaeus. 

 Aphidce, Curtis, Westwood. 

 Aphidina, Burmeister, Walker, Hartig. 

 Apliidinca, Rondani. 

 Aphididm, Passerini. 

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

 the family or sub-family." 



The family APHIDID^E may be divided into six tribes viz., 

 Aphidinae, Lachninae, Schizoneurinae, Pemphiginae, Chermesinae, 

 and Rhizobinae. 



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. Antennae 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. 



Melanoxanthus. Callipterus. 



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

 six joints, 7th rudimentary. Genera 



Pterocallis. Stom aphis. 



Phyllaphis. Dryobius. 1 



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. Antennas short, 

 six joints ; 7th rudimentary. Genera 



Pemphigus. Tetraneura. 



1 The above is adapted from Buckton, as it is rather difficult to reconcile his 

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



