[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
Cook & Loomis, 1928
Millipeds of the order Colobognatha, with descriptions of six new genera and type species, from Arizona and California
Proc. U.S. Nat. Mus., 72 (art. 18): 1-26, f. 1-6, pls. 1-2
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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.