The pupa is moveable.
Finally, the anterior and posterior pair of wings become wholly dissimilar to each other, the former being horny, and the latter membranous in texture with reticulated veins, provided likewise with joints like the legs, so that they can be folded up under the anterior pair or elytra—Ceratoptera, as the Beetles.
Pupa state perfect.
Strictly speaking, it is a matter of indifference whether the names of orders and families be adopted from the first or second parallel series; whether e. g. we speak in the first cohort of Protozooid or Worm-flies. The nearest series will, however, bear the greater amount of resemblance to them. Meanwhile I will in the sequel vary in the choice of names, in order to exhibit different samples of this double parallelism.
COHORT I. WORM-FLIES—TRACHEOPTERA.
3518. Wings membranous with few longitudinal ducts, and almost devoid of transverse ducts, eyes larger than head. Here belong the Flies, Bees, and Butterflies. The abdomen is indeed annulate, but soft; its first ring is frequently set free and unites with the thorax, but supports neither feet nor wings.
The sexual parts always lie at the anal extremity.
The head is almost nothing but eye, and the Insects of this order may very well be termed Megalopidæ, or large-eyed, out of contrast to the succeeding ones. Between the two large compound eyes there are usually found three simple ocular puncta or ocelli, which they have adopted from the preceding class.
The larvæ are either entirely apodal, white and soft like Entozoa, or they have, in addition to the thoracic feet, numerous abdominal feet like the higher Worms.
The Flies with their soft and imperfect body, and the apodal larvæ, repeat the Infusoria and Entozoa; the Bees therefore the Polyps and Red-blooded Worms; the Butterflies with their large farinose or dusty wings and polypodal caterpillars, the Acalephæ and Holothuriæ.