Hister umbrosus, Taxa Only, Exact Match: 2 Treatments

Margarinotus (Ptomister) umbrosus			Caterino, Michael S., 2010, A Review of California Margarinotus Marseul (Coleoptera: Histeridae: Histerinae: Histerini), with Descriptions of Two New Species, The Coleopterists Bulletin 64 (1), pp. 1-12 : 8	8
Crenulister umbrosus		sp. n.	Caterino, Michael S. & Tishechkin, Alexey K., 2014, New genera and species of Neotropical Exosternini (Coleoptera, Histeridae), ZooKeys 381, pp. 11-78 : 54-56	54-56