[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
Some records and descriptions of American diplopods
Proc. Biol. Soc. Washington, 56: 143-152, pls. 7-8, f. 1-15
Chamberlin & Mulaik, 1941
On a collection of millipeds from Texas and New Mexico
Journ. New York Ent. Soc., 49 (1): 57-64
Notes on the distribution of millipeds in southern Texas, with descriptions of new genera and species from Texas, Arizona, Mexico, and Costa Rica
Proc. U.S. Nat. Mus., 40: 147-167
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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.