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Some related literature:
[NAML]; Chamberlin & Hoffman, 1958
Checklist of the Millipeds of the North America
U.S. Nat. Mus. Bull. 212
Notes on female paraiulids, with description of a new species
Ann. Ent. Soc. Amer. 15 (4): 281-309, pls. 19-24, f. 1-57
On five new North American millipeds and records of some established species
Amer. Midl. Nat., 50: 152-158, f. 1-14
Diplopoda from the western states
Ann. Ent. Soc. Amer., 3 (4): 233-262, pls. 30-43
Proc. Biol. Soc. Washington, 51: 205-208
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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.