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