Species Temnostoma excentrica

used to be treated as synonymous with the European T. vespiforme (Linnaeus 1758); the nearctic records of the latter refer to T. excentrica

Temnostoma excentrica (Harris 1862)

The species has two morphs which may prove to be distinct species with genetic analysis. A grey morph which is transcontinental and a yellow morph found in the Appalachian mountains.

Transcontinental. Found from Alaska East to New Brunswick. Then the species follows the Appalachian Mountains South to Georgia. Also found in Rocky Mountain states bordering the Great Plains. The species is found in Washington but does not make it farther South along the Pacific Coast.

Often found in forests. Larvae live in decaying wood.

Summer, Fall