Enicospilus purgatus

Appearance

Large insects - approximately 25 mm long. The bodies of these wasps are mottled tan, orange and brown with dark eyes. The 'horses-head' shape formed by veins in the front wings, along with the divided second section of the legs are key characteristics that identify this wasp as belonging to the family Ichneumonidae. The four large wings distinguish this wasp from similar looking flies. The antennae are exceptionally long, and the legs are also long. The abdomen is flattened, so that it appears very narrow from above.

Distribution

Native throughout eastern North America.

Behavior

These are large, stingless wasps are commonly found at porch lights due to their unique habit (at least for wasps) of flying at night (i.e. nocturnal). Their size and shape means they may be mistaken for crane flies. They parasitize the larvae (caterpillars) of various large moths. Because they are parasitic on other insects and don't defend large colonies, they are harmless to humans.