A Comparative Altitudinal Study of Passalid Beetles (Coleopters, Passalidae) on Volcanoes "Atitlan" and "Santa Maria," Guatemala, Central America: January-March 1977
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The passalid beetle populations of volcanoes Atitlan and Santa Maria, located in midwestern Guatemala, Central America, were sampled along altitudinal transects between 600 m (2,000 ft.) and 3500 m (12,000 ft.) elevation. In all, 13 species in 9 genera were found, largely the same on both volcanoes and occupying similar altitudinal ranges. From the obtained data, certain geographical and ecological extensions over the known ranges of some species can be made. Three species of the genus Chondrocephalus and Ogyges laevissimus were found to be restricted to high-altitude mountain forests and present similar distributions on both volcanoes. No beetles were found above 2700 m elevation on either volcano, despite the presence of moist, rotting logs, in which passalids normally live.