Corn prices dove lower late in the session after trading lower all day, after the USDA on Monday afternoon detailed farmers' progress harvesting this year's crop, a process that has been impeded by rainy weather in some parts of the country. Though the harvest has run behind schedule, farmers brought in about one-fifth of the crop in the week ended, while anecdotal reports on yields continued to support projections for U.S. farmers to produce well over 14 bil bu.