[maps] Warning! The maps are automatically generated from the textual information, and the process does not always produce acceptable result; See about maps for more info.
Some related literature:
[NAML]; Chamberlin & Hoffman, 1958
Checklist of the Millipeds of the North America
U.S. Nat. Mus. Bull. 212
New genera and species of chordeumoid millipeds in the United States, and notes on some established species
Proc. Biol. Soc. Washington, 64: 117-124, f. 1-18
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Keep in mind that the taxonomic information is copied from various sources, and may include many inaccuracies. Expert help is welcome.