|
| 1a |
6 legs, three body sections |
Go to 3 |
| 1b |
Not exactly as above |
Go to 2 |
| 2a |
8 legs, two body segments, no tail |
 Araneae |
| 2b |
10 legs, stinging tail, pinchers on front appendages |
 Scorpiones |
| 3a |
Wings obvious and/or hard (or leathery) covering. (ladybug) |
Go to 4 |
| 3b |
Wings absent |
Go to 11 |
| 4a |
Two wings (or two wings with tiny, vestigal hindwings), no horny or leathery sheath |
 Diptera |
| 4b |
Four wings (or two wings covered by a horny or leathery sheath) |
Go to 5 |
| 5a |
Hind-wings partly or entirely covered by horny or leathery sheath (grasshopper) |
Go to 6
|
| 5b. |
Both pairs of wings are entirely membranous (wasp) |
Go to 10
|
| 6a. |
Tube-like mouthparts (for sucking not chewing) |
Hemiptera (true bugs)
  |
| 6b. |
Biting/chewing mouthparts |
Go to 7
|
| 7a |
Body flattened; antennae long and uniformly thin |
 Blattodea |
| 7b. |
Body rounded or square-like rather than flattened |
Go to 8
|
| 8a. |
Hind legs (esp. femur) enlarged (drumstick-like) for jumping |
 Orthoptera |
| 8b. |
Hind femurs not enlarged |
Go to 9
|
| 9a |
Leathery sheath is short, vest-like and cerci at end of abdomen |
 Dermaptera |
| 9b |
Leathery sheath capable of completely covering hind wings and no cerci |
Coleoptera (beetles)  |
| 10a |
Tube-like mouthparts (sucking, not chewing) |
  Homoptera |
| 10b |
Biting/chewing mouthparts |
Hymenoptera; Go to 11 |
| 11a |
Elbowed antennae and distinct dorsal bump on slender segment connecting thorax and abdomen |
 Formicidae |
| 11b. |
Antennae not elbowed or no dorsal bump |
 other Hymenoptera  |
