Order Trichoptera—Wings unequal, clad with hairs or scales. Caddis flies.
Order Aphaniptera—No wings, no compound eyes. Fleas.
Order Diptera—Two membranous wings. Flies.
Order Lepidoptera—Wings clad with scales. Butterflies and Moths.
Order Coleoptera—Fore wings hard and horny. Beetles.
Order Hymenoptera—Four membranous wings. Larvæ, footless grubs. Ants, Bees, &c.
CHAPTER XIV
MARINE VERTEBRATES
The vertebrates form the highest sub-kingdom of animal life—the sub-kingdom to which we ourselves belong, the chief distinguishing characteristic of the group being the presence of an internal skeleton, the principal part of which consists of a rod or column of cartilaginous or bony material running along the dorsal side of the body, known as the vertebral column.