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On this day in Lewis & Clark history...

At Camp White Fish, Lewis completes his astronomical observations, the boats are loaded, and the Expedition sets out at midday. At their evening camp north of present Omaha, Nebraska, they are tormented by mosquitoes.

From the journals...

Camped in a Bend to the L. Side in a Coops of Trees, a verry agreeable Breeze from the N W. this evening. I Killed a Deer in the Prarie and found the Misquitors So thik & troublesom that it was disagreeable and painfull to Continue a moment Still.

William Clark

Mosquito, Culex quinquefasciatus

Blood engorged mosquito on a human finger

Photo created by the U.S. Center for Disease Control.