Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] CHAPTER XII THE BEETLES (COLEOPTERA) Characteristics. Fore-wings, horny or leathery, forming wing-covers (elytra), which meet in a straight line down the back; hind-wings, membranous, tips folded back under the wing-covers when at rest; mandibulate mouth-parts; metamorphosis, complete. • The hard wing-covers of this order are so characteristic that a beetle is commonly recognized as such, and they have given the FIG. 189. A water-scavenger beetle with wing-covers and wings expanded as when in flight.
Elementary entomology ([c1912]) Elementary entomology elementaryentomo00sand Year: [c1912] CHAPTER XII THE BEETLES (COLEOPTERA) Characteristics. Fore-wings, horny or leathery, forming wing-covers (elytra), which meet in a straight line down the back; hind-wings, membranous, tips folded back under the wing-covers when at rest; mandibulate mouth-parts; metamorphosis, complete. • The hard wing-covers of this order are so characteristic that a beetle is commonly recognized as such, and they have given the FIG. 189. A water-scavenger beetle with wing-covers and wings expanded as when in flight. (Natural size) (After Folsom) order its scientific name, from coleos (a sheath) and pteron (a wing). The beetles form one of the largest orders, with over twelve thousand species in America north of Mexico, belonging to some eighty families, only the most common of which will be mentioned. They have a complete metamorphosis, the larvae being commonly called grubs, and the pupae are usually found either in the ground 136
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