I picked up a copy of, The flies of Western North America, by Frank R. Cole off the internet for $40. It is a detailed level book, and the keys are technical but usable and covers Diptera. Rob Sandelin South Snohomish County at the headwaters of Ricci Creek Sky Valley Environments <http://www.nonprofitpages.com/nica/SVE.htm> Field skills training for student naturalists Floriferous@msn.com
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