Key to the Families of North American Insects: An Introduction to the Classification of Insects
The Authors, 1916 - Insects - 140 pages
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abdomen abdominal segments absent anal antennŠ apex apical basal base bees beetles beneath body bristles broad cerci closed club color constricted costa couplet covered coxal cavities crossveins cubital cells developed dilated distinct dorsal elongate elytra entire extending eyes female femora five five-jointed flattened folded fore wings formed four fourth Front coxŠ fused grooved hairs hairy head Hind coxŠ hind wing insects joint lateral least legs less lobed longer male mandibles margin maxillary palpi meeting membranous mesosternum middle minute moths narrow nearly never ocelli ORDER oval ovipositor pair petiolate plates posterior present produced prolonged prominent pronotum prothorax Pupa radial radius rarely rounded scales separated short shorter side similar simple slender sometimes species spines spurs stout strong strongly Subcosta suture Tarsal claws tarsal joint tarsi thickened third thorax tibia tibiŠ transverse usually vein ventral segments wide wingless