We have evidence of a novel species of Tamalia (Hemiptera: Aphididae) aphid previously lumped within Tamalia coweni (Cockerell). The genus Tamalia is distinctive within Aphididae for its facultative communal galling behavior. Although T. coweni is polyphagous on various Ericaceae, recent evidence from mtDNA from many Tamalia samples indicated three potentially cryptic species exhibiting a high degree of fidelity to particular host plant species. Although all are apparently host-specific, the three species share with T. coweni the communal galling habit.