Figure 31.27 Diverse Pterygotes (A) Unlike most flying insects, a dragonfly cannot fold its wings over its back. (B) Orthopteran insects such as grasshoppers have incomplete metamorphosis: they undergo several molts, but the juvenile instars resemble small adults (incomplete metamorphosis). (C) Hemipterans such as this red cotton bug are known as “true” bugs. (D–H) Holometabolous insects undergo complete metamorphosis. (D) A larval caddisfly (bottom) emerges from its dark pupal case. (E) The beetles (Coleoptera) comprise the largest insect group; beetles such as this dogbane leaf beetle account for more than half of all holometabolous species. (F) Butterflies and moths are the lepidopterans, whose phases of complete metamorphosis are familiar to many (see Figure 30.10). (G) Blowflies are among the “true” flies, the Dipterans. Adult blowflies feed on pollen or nectar, but lay their eggs on carrion, upon which the larvae feed. (H) These paper wasps are hymenopterans, a group in which most members display social behaviors.