A Review of California Margarinotus Marseul (Coleoptera: Histeridae: Histerinae: Histerini), with Descriptions of Two New Species Author Caterino, Michael S. Santa Barbara Museum of Natural History, 2559 Puesta del Sol Rd., Santa Barbara, CA 93105, U. S. A mcaterino@sbnature2.org text The Coleopterists Bulletin 2010 2010-03-01 64 1 1 12 journal article 10.1649/0010-065X-64.1.1 1938-4394 4892928 Margarinotus ( Ptomister ) umbrosus (Casey, 1893) ( Figs. 5E–G , 6 ) Hister umbrosus Casey 1893: 547 . Hister umbratilis Casey 1916: 217 ; Wenzel 1960: 459 . Synonym. Margarinotus umbrosus (Casey) ; Wenzel 1944: 126 . Diagnosis. PEL= 3.43–4.86 mm ; PNW= 2.62– 4.30 mm . See diagnosis under M. umbilicatus for a diagnosis of this species. In more northern populations assigned to this species, especially in British Columbia , the lateral apical teeth of the median lobe tend to be much reduced, almost disappearing to leave a single median tooth in many individuals. In California populations the lateral teeth are usually well developed, though smaller than the median one. Remarks. Margarinotus umbrosus seems to be a more generalist species than its close relatives, having been recorded from dung, carrion, and decaying vegetation. Distribution ( Fig. 6 ). This species occurs along the Pacific coast from central California (Marin Co.) through British Columbia ranging eastward in the north to Montana and Alberta .