'Faster than the black flies'

"A Maine fishing camp! The state that's given American culture the lumberman, the lobsterman, the Maine guide, has also given it this: the camp in the woods where the trout bite even faster than the black flies, the salmon leap into your canoe of their own volition, the griddle cakes come stuffed with blueberries, the loon calls at night, the moose bellows, and you sleep soundly under thick wool blankets even in July.''
 

-- From One River More, by W.D. Wetherell

Successful fishermen at Oak Point Camps, Portage Lake, Maine, around 1900.