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Tribe Pemphigini

white fuzzy clump bug - Grylloprociphilus imbricator cluster of aphids? - Neoprociphilus aceris Pemphigus populitransversus, gall on cottonwood - Pemphigus populitransversus Pemphigus populitransversus Pachypappa pseudobyrsa Aphids? - Prociphilus Beech Blight Aphid?  - Grylloprociphilus imbricator Gall Aphids on Cottonwood Petiole - Pemphigus - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Sternorrhyncha (Plant-parasitic Hemipterans)
Superfamily Aphidoidea
Family Aphididae (Aphids)
Subfamily Eriosomatinae (Woolly Aphids and Gall-making Aphids)
Tribe Pemphigini
Remarks
All aphid galls on poplars are caused by members of this tribe.