An Introduction to the Study of Insects

3-segmented abdomen abdominal segments absent adults America anal animals antennae apex aphids apical appendages aquatic basal base bees beetles body bristles brownish bugs chelicerae color common compound eyes Courtesy coxae crickets cross veins Cu₁ developed Diptera discal cell dragonflies eggs elongate elytra Ephemeroptera Fabricius Family feed female femora Figure flattened fleas flies front coxae front wing genera genus grasshoppers head Hemiptera hind wings host Hymenoptera illus insects instar labium larvae leafhoppers length Lepidoptera less lobe M₁ male mandibles margin maxillary palps membranous ment metamorphosis mites molt moths mouth nests North American species nymphs ocelli Odonata opisthosoma Orthoptera oval ovipositor parasites pests plant posterior predaceous pronotum prothorax R₁ sclerites sects slender species occur specimens spiders spines spiracles structure Subfamily suborder Superfamily suture tarsal segment tarsi thorax tibiae United Univ variable venation ventral wasps widely distributed wingless