Class IV. The Myriapoda (Centipedes, etc.).
Class V. The Arachnida (Spiders, Mites, etc.).
Class VI. The Insecta (Insects).
That branch of zoölogy which treats of insects is known as entomology.
The Insecta have been variously subdivided by different scientific writers, but the following subdivision has much in it to commend it, and will suffice as an outline for the guidance of the advanced student.
Class VI. Insecta (Insects proper)
Heterometabola
For the most part undergoing only a partial metamorphosis in the development from the egg to the imago.
ORDERS
- 1. Thysanura.
- Suborders:
- Collembola (Podura, Springtails).
- Symphyla (Scolopendrella).
- Cinura (Bristletails, etc.).
- 2. Dermatoptera (Earwigs).
- 3. Pseudoneuroptera.
- Suborders:
- Mallophaga (Bird-lice).
- Platyptera (Stone-flies, Termites, etc.).
- Odonata (Dragon-flies, etc.).
- Ephemerina (May-flies, etc.).
- 4. Neuroptera (Corydalis, Ant-lion, Caddis-flies, etc.).
- 5. Orthoptera (Cockroach, Mantis, Mole-cricket, Grasshopper, Katydid, etc.).
- 6. Hemiptera.
- Suborders:
- Parasita (Lice).
- Sternorhyncha (Aphids, Mealy Bugs, etc.).
- Homoptera (Cicada, Tree-hoppers, etc.).
- Heteroptera (Ranatra, Belostoma, Water-spiders, Squash-bugs, Bedbugs, etc.).
- 7. Coleoptera.
- Suborders:
- Cryptotetramera (Lady-birds, etc.).
- Cryptopentamera (Leaf-beetles, Longhorns, Weevils, etc.).
- Heteromera (Blister-beetles, Meal-beetles, etc.).
- Pentamera (Fire-flies, Skipjacks, June-bugs, Dung-beetles, Stag-beetles,
- Rove-beetles, Tiger-beetles, etc.).