Nearctic (most of the US and adjacent Canada, south into n. Mexico); in our area, A. sanctaecrucis is transcontinental, 4 spp. are western, and A. discoideus, eastern (widespread east of the Rockies)(1)
Contributed by v belov on 11 January, 2011 - 12:46pm Last updated 20 August, 2014 - 10:01am
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