"... when the weather stays hot and mosquitoes are plenty, the hours of darkness, even in midsummer, seem painfully long. In the Bad Lands proper we are not often bothered very seriously by these winged pests; but in the low bottoms of the Big Missouri, and beside many of the reedy ponds and great sloughs out on the prairie, they are a perfect scourge. During the very hot nights, when they are especially active, the bed-clothes make a man feel absolutely smothered and yet his only chance for sleep is to wrap himself tightly up, head and all; and even then some of the pests will usually force their way in. At sunset I have seen the mosquitoes rise up from the land like a dense cloud, to make the hot, stifling night one long torture; the horses would neither lie down nor graze, traveling restlessly to and fro till daybreak, their bodies streaked and bloody, and the insects settling on them so as to make them all one color, a uniform gray; while the men, after a few hours' tossing about in the vain attempt to sleep, rose, built a little fire of damp sage brush, and thus endured the misery as best they could until it was light enough to work."