Margarinotus (Ptomister) umbilicatus (Casey, 1893)

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 : 7-8

Margarinotus (Ptomister) umbilicatus (Casey, 1893) ( Figs. 5A–D , 6 )

Hister umbilicatus Casey 1893: 545 . Margarinotus umbilicatus (Casey) ; Wenzel 1944: 126.

Remarks. The majority of specimens of this species have been taken from wood rat nests. In the northern part of the range, where specimens more closely resemble M. umbrosus , generalist records are more common (e.g. rotting vegetation, dung, etc.) than in the south.

Distribution ( Fig. 6 ). This species was described from Marin County, and Fall (1901) lists only this record. The species occurs throughout central and southern California from around Sacramento southward to San Diego. The northernmost definite records are from the Clear Lake region (Lake County).

Figures

Fig. 5. Margarinotus umbilicatus and Margarinotus umbrosus, median lobe of aedeagus. A. M. umbilicatus, dorsal view. B. M. umbilicatus, lateral view. C. M. umbilicatus, apical view of gonopore (variant). D. M. umbilicatus (typical form), apical view of gonopore. E. M. umbrosus, apical view of gonopore. F. M. umbrosus, dorsal view. G. M. umbrosus, lateral view.

Fig. 6. Map of known California localities for Margarinotus spp.