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For Insects, Spiders & Their Kin
For the United States & Canada
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A series of monographs about insect groups as they exist in California (in PDF format). Many useful keys and descriptions, though most are over the head of the non-entomologically-trained. Even so, amateurs will find useful information even if they can't make full use of the articles.
http://essig.berkeley.edu/resources/cis_publications.shtml

Direct Link
Hardy, D. E. 1961. The Bibionidae of California. Bulletin of the California Insect Survey 6(7): 179-195, 17 text figs., 3 maps
https://essig.berkeley.edu/documents/cis/cis06_7.pdf

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