Animals possessing an external skeleton composed of chitinous rings, or somites, and provided with articulated limbs.
Ceratophora.
- Class I. Peripatidea (Genus Peripatus).
- Class II. Myriapoda.
- Orders:
- 1. Diplopoda (Galley-worms, etc.).
- 2. Pauropida (Genus Pauropus, etc.).
- 3. Chilopoda (Centipedes, etc.).
- Class III. Hexapoda (Insects proper).
- Orders:
- 1. Thysanura.
- Sub-orders:
- Collembola (Podura, Spring-tails).
- Symphyla (Scolopendrella).
- Cinura (Bristle-tails, etc.).
- 2. Dermatoptera (Ear-wigs).
- 3. Pseudoneuroptera.
- Sub-orders:
- Mallophaga (Bird-lice).
- Platyptera (Stone-flies, Termites, etc.).
- Odonata (Dragon-flies, etc.).
- Ephemerina (May-flies, etc.).
- 4. Neuroptera (Corydalis, Ant-lion, Caddis-flies, etc.).
Heterometabola. For the most part undergoing only a partial metamorphosis in the development from the egg to the imago.
- 5. Orthoptera (Cockroach, Mantis, Mole-cricket, Grasshopper,
- Katydid, etc.).
- 6. Hemiptera.
- Sub-orders:
- Parasita (Lice).
- Sternorhyncha (Aphids, Mealy-bugs, etc.).
- Homoptera (Cicada, Tree-hoppers, etc.).
- Heteroptera (Ranatra, Belostoma, Water-spiders,
- Squash-bugs, Bed-bugs, etc.).
- 7. Coleoptera.
- Sub-orders:
- Cryptotetramera (Lady-birds, etc.).
- Cryptopentamera (Leaf-beetles, Long-horns, Weevils,
- etc.).
- Heteromera (Blister-beetles, Meal-bugs, etc.).
- Pentamera (Fire-flies, Skip-jacks, June-bugs,
- Dung-beetles, Stag-beetles, Rove-beetles, Water-beetles,
- Tiger-beetles, etc.).
- 8. Aphaniptera (Fleas).
- 9. Diptera.
- Sub-orders:
- Orthorhapha (Hessian-fly, Buffalo Gnats, Mosquitoes,
- Crane-flies, Horse-flies).
- Cyclorhapha (Syrphis, Bot-flies, Tsetze, Housefly,
Metabola. Undergoing for the most part a complete metamorphosis from egg through larva and pupa to imago.
- etc.).
- 10. Lepidoptera.
- Sub-orders:
- Rhopalocera (Butterflies).
- Heterocera (Moths).
- 11. Hymenoptera.
- Sub-orders:
- Terebrantia (Saw-flies, Gall-wasps, Ichneumon-flies,
- etc.).
- Aculeata (Ants, Cuckoo-flies, Digger-wasps, True
- Wasps, Bees).
Acerata.
- Class I. Crustacea (Barnacles, Crabs, etc.).
- Class II. Arachnida.
- Orders:
- 1. Acarina (Mites).
- 2. Araneina (Spiders).
- 3. Pedipalpi (Whip-scorpions, etc.).
- 4. Solpugæ (Whip-scorpions).
- 5. Pseudoscorpii (False Scorpions).
- 6. Scorpiodea (True Scorpions).
- Class III. Pantopoda (Pyenogonida, Sea-spiders).
- Class IV. Tardigrada (Macrobiotus, etc.).
- Class V. Gigantostraca (Horse-shoe Crabs, Trilobites, etc.).
- Class VI. Linguatulina (Pentastoma, etc.).