Originally Posted by
DanK
Nice captures.
Geoff--I wondered the same thing, but I don't know enough. I don't have a single authoritative source, and the sources online are inconsistent. Worse, at least in this country, the most common "hornet", the bald-faced hornet, isn't a hornet at all. And there are something like 20 species of true hornets, and some of the descriptions cover only some of them (like the sources that say that they are black and white, not yellow). And, of course, there a a lot of wasp species, and they differ a great deal.
Looking for consistencies in all of this, this is what I come up with, which might simply be wrong:
1. Hornets are the largest wasps.
2. They have more bulbous, rounded abdomens than most other wasps.
3. Many but not all are black and white
4. They tend to hold their wings swept back when at rest, which many species of wasps don't (but some do)
5. Hornets have a wider space between the eyes than do most wasps.
6. The European hornet is not terribly aggressive unless you get close to the nest, but some other hornets are extremely aggressive.
7. The venom of hornets is much stronger than that of most wasps.
If 1, 2, and 4 are correct (can't see #5) (a big "if"), then I would guess hornets. Am I off track?