Silphidae in Mexico, as in other countries, are a broadly studied family of Coleoptera. However, their geographical distribution in this country has been poorly analyzed. The aim of this study was to perform a track analysis of the Mexican species of Silphidae to discuss their distribution patterns. We used bibliographic and new distribution data of 11 Mexican species of Silphidae to construct their individual tracks in maps of biogeographic provinces. The superposition of these tracks allowed detection of generalized tracks, which were compared with previously published distribution patterns to propose hypotheses of primary biogeographic homology. We record Nicrophorus olidus Matthews, 1888 for the first time in Nicaragua and confirm its presence in Honduras. Additionally, three species are new state records for Aguascalientes, and new localities are provided for seven species. We recovered three main distribution patterns. Four species correspond to the Californian Nearctic pattern, followed by the continental Nearctic plus the montane Mexican pattern represented by three species, and the Mesoamerican plus the montane Mexican pattern constituted by two species. Each of the last two species showed a unique distribution. Seven of the 11 Mexican silphid species show Nearctic affinity, three have a Neotropical affinity, and one is endemic to the montane Mexican component. Patterns detected for Mexican silphids have been documented for other families of Coleoptera, thus they can be postulated as hypotheses of biogeographic primary homology. These hypotheses should be tested with other biological groups, and their causes need to be investigated with different historical biogeographical methods.
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Vol. 69 • No. 4