Fossil Arthropods of California: 11. Descriptions of the Dung Beetles (Scarabaeidae) of the Tar Pits
In sorting the vast amount of insect material extracted from the asphaltum of Rancho La Brea, Hancock Park, Los Angeles, the most exciting material so far segregated is a series of fragments of five or six species of Scarabaeidae, or dung beetles, belonging to the genera Canthon, Copris, and Onthophagus, and one which must be separated as a new genus between Copris and Phanaeus.
Pierce, W. Dwight
"Fossil Arthropods of California: 11. Descriptions of the Dung Beetles (Scarabaeidae) of the Tar Pits,"
Bulletin of the Southern California Academy of Sciences:
Available at: https://scholar.oxy.edu/scas/vol45/iss3/3