As Jan pointed out, Aristolochia doesn't actually eat insects. Here's some
other interesting plants that have structures to trap insects but are not
cp's. Most are in cultivation:
Coryanthes - an orchid genus in which the flowers have an upside down basin
filled with an intoxicating liquid - a bee falls in, gets drunk, and picks
up pollen bundles as it staggers out. These can be grown with lowland
Nepenthes, if you use a fan for air circulation.
Aesclepiadaceae - many milkweed relatives temporarily detain insects in
their flowers. Good examples include some Ceropegias (haygarthii,
balleyana and others), Pseudomallum pectinarium.
Araceae - others know more about this than me, but there's a number of
aroids, including some Amorphophallus, which have collapsing flowers
designed to temporarily trap pollinators.
A little off the cp thread, but interesting anyway.