Information is presented dealing with the western North American species of the subfamily Donaciinae, with emphasis on data from the state of Utah. Dichotomous keys and short diagnoses are provided to enable identification of genera and species. Previously published records from Utah are summarized. For each species, the overall North American distribution is summarized, and detailed records are given for Utah. Reported host plants for each species are also listed.

We examined the biogeography of aquatic and semiaquatic Heteroptera (ASH) in the Grand Canyon (GC) ecoregion (GCE) on and adjacent to the southern Colorado Plateau. We report 89 ASH taxa in 86 species, 37 genera, and 14 families in the GCE, including 54 ASH taxa detected within or on the rims of GC and its major tributaries, a fauna 3.8-fold greater than previously reported. We tested 2 groups of biogeographic hypotheses to account for this high level of diversity, demonstrating an underlying pattern of mixed biogeographic affinity and strong landform-climate effects. Equal numbers of ASH taxa were derived from allochthonous (neotropical and nearctic) sources and autochthonous (range-centered) sources. A negative linear relationship existed between area-adjusted ASH taxon density and elevation, with more Mexican/neotropical taxa at low elevations and more nearctic taxa at higher elevations. While species richness was positively scale dependent, biogeographic landform impacts were unrelated or negatively related to spatial scale. The uplifted southern margin of the Colorado Plateau along the Mogollon Rim supported elevated ASH diversity as a function of ecotone effects and interprovincial basin connectivity. Barrier/filter effects were stronger than null, or refuge effects, and little endemism was detected in the GCE. Colonization history varied across elevation and in relation to landscape evolution. No reported GCE taxa have been extirpated, but 52.8% of the fauna occurred at 3 or fewer localities (primarily springs), sites that may be threatened by habitat alteration and climate change.

Great Basin National Park in east central Nevada encompasses most of the southern Snake Range including Wheeler Peak, which at 3980 m is the highest peak in the interior Great Basin. The original detailed surveys of the mammals of this region were made between 1929 and 1939 by field crews from the Museum of Vertebrate Zoology, University of California, Berkeley. Between 2000 and 2003, we conducted additional field surveys of mammals in the park region in conjunction with the National Park Service Inventory and Monitoring Program. Here, we provide a comprehensive report on the mammal fauna of the park and its immediate surroundings based on a review of historical records and recent field surveys. We document 48 native species of mammals in the region. In addition, there are 7 species that potentially occur within the park, 4 species of questionable occurrence, 6 species formerly present but now extirpated, and 4 nonnative species. We provide a short account for each species that summarizes ecology and local distribution and lists both historical and recent records of occurrence. Through comparative analysis of historical and recent data, we examine faunal changes in the park region during the past 70 years. Based on our results, we make some general recommendations for future resource management.