Feeder Insects

Cockroaches

Mantids

Phasmids

Assassin Bugs

Beetles

Other Insects

Photos: Stock
Not all of these will be of interest to the vivarium hobbyist, but insects in general are an interesting lot.

Herper.com's general insect pages:

Lepidoptera:

Crickets, Katydids, Cicadas:

Other insects: