Butterfly Occurrence Database

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This [now retired?] data set portrays the occurrence of butterflies in counties in the United States. Butterfly occurrence data are cumulative, so positive occurrence data do not necessarily imply current residence of the species. Most records are from the 30 to 40 years before publication, with a few records that date from as early as the late 1800s.

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ELECTRONIC FILE - Zoology: Invertebrates

SWAP (2/19/2016) citation [with URL added]:
[USGS] US Geological Survey. 2002. Butterfly Occurrence Database. Reston (VA): National Atlas of the United States. [accessed 2014 Sep 29]. http://nationalatlas.gov/atlasftp.html?openChapters=chpbio#chpbio.
[https://www.sciencebase.gov/catalog/item/4f4e477ce4b07f02db47fe5a].

See also https://www.sciencebase.gov/catalog/file/get/4f4e477ce4b07f02db47fe5a?f=... for information about the database

Note: URL doesn't work on 3/23/16, and this dataset might be retired. Note also that the author at one of these links is listed as National Atlas of the United States, but on the other, the "originator" (no "author" mentioned) is given as US Geological Survey.