Hemiptera Linnaeus, 1758 - true bugs Sternorrhyncha Amyot & Audinet-Serville, 1843 - aphids, psyllids, whiteflies and scales Aphidodea Phylloxeroidea Herrich-Schaeffer, 1854 Adelgidae (Annand, 1928) - adelgids Adelginae Adelges Vallot, 1836 Gilletteella Börner, 1930 1 Adelges cooleyi (Gillette, 1907) - Cooley spruce gall adelgid