Microplitis croceipes is a braconid wasp native to the US state of Georgia.

[2] Microplitis croceipes uses its antennae to detect the odor of caterpillar frass, or feces.

[5] Because the olfactory system of M. croceipes is linked to its taste receptors, wasps can be trained to respond to the smell of an arbitrary chemical if the smell is repeatedly presented in association with food (sugar water or caterpillars).

[4] The smell of "food" triggers a characteristic pattern of activity, a short-range host-seeking response.

"[2] The Wasp Hound "portable nose" device depends on trained M. croceipes as its biosensor.