original descriptionChamberlin, R. V. (1918). New spiroboloid diplopods. Proceedings of the Biological Society of Washington, 31: 165-170 page(s): 167 [details]
original description(ofHesperolus Chamberlin, 1918)Chamberlin, R. V. (1918). New spiroboloid diplopods. Proceedings of the Biological Society of Washington, 31: 165-170 page(s): 169 [details]
original description(ofOrthichelus Chamberlin & Hoffman, 1950)Chamberlin, R. V.; Hoffman, R. L. (1950). On some genera and families of North American diplopods. Natural History Miscellanea, 71: 1-7. Chicago page(s): 7 [details]