Although the patronym was not identified; Eigenmann mentioned a “Dr. F. M. Chapman” in a later (1942) publication, who was a traveling companion in South America; this may have been ornithologist Frank M. Chapman (1864-1945), American Museum of Natural History.[4]
Eschmeyer, William N., ed. 1998. Catalog of Fishes. Special Publication of the Center for Biodiversity Research and Information, num. 1, vol. 1–3. California Academy of Sciences. San Francisco, California, United States. 2905. ISBN0-940228-47-5.