|
| 1a. |
Insect with wings
(though forewings may be partly or entirely stiffened as 'wing-covers'
or 'wing-cases' and not used in flight) |
2 |
|
| 1b. |
Insect without
wings (though some forms may retain vestigial wings resembling
small scales or pads) |
Part 3 of the Key |
|
|
| 2a. |
One pair of wings |
3 |
|
| 2b. |
Two pairs of wings |
Part 2 of the Key |
|
(insect with one pair of wings) |
| 3a. |
Dorsal surface of the
prothorax extended backwards over the abdomen; hind-legs enlarged and
modified for jumping; insect grasshopper-like in general appearance |
Orthoptera |
 |
| 3b. |
Insect not like this |
4 |
|
|
| 4a. |
Wings horny or leathery
(stiffened) and not used for flying |
5 |
|
| 4b. |
Wings membranous (flexible)
and used for flying |
6 |
|
|
| 5a. |
Wings overlapping at
least a little in the centre-line and with obvious veins present |
Phasmida |
|
| 5b. |
Wings (elytra) meeting
in the centre-line (sometimes fused together) and without veins
(elytra may have longitudinal grooves or striae which should not be
confused with veins) |
Coleoptera |
|
|
| 6a. |
Abdomen with one or more long
terminal appendages |
7 |
|
| 6b. |
Abdomen without terminal
appendages |
8 |
|
|
| 7a. |
Wings with only one
forked vein; antennae relatively long; small insect usually less than
5 mm long |
Hemiptera |
|
| 7b. |
Wings with many veins;
antennae short; larger insect |
Ephemeroptera |
|
|
| 8a. |
Thorax with a pair of
club-shaped structures (halteres) lying just in front of the wings |
Strepsiptera |
|
| 8b. |
Thorax with a pair of
club-shaped structures (halteres) lying just behind the wings (may
be hidden by body hairs and other structures) |
Diptera |
|
|
