The additional specimen, "No.8444", is a female; all three fossils are currently residing in Harvard University's Museum of Comparative Zoology paleoentomology collections.

[1] A. exhumatum was first studied by Theodore Cockerell, who published the type description in the Bulletin of the Museum of Comparative Zoology, 1906.

[1] Both the head and thorax are a uniform dark coloration and were black in life and the mesothorax is rough in texture.

The abdomen on contrast possesses large pale reddish bands which have no darkening along the margins and no spots visible.

[1] The hind legs display flattened tarsi and the tibia have distinct and abundantly hairy scopa.