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* Soymeal shipped from the US Gulf Coast remained more expensive than South American supplies and that premium could expand for shipments in 2019, when Brazil and Argentina are expected to harvest big soy crops.
* The US Department of Agriculture will release weekly US export sales data on Thursday, and the agency also will update global supply and demand outlooks in a monthly report.
* Buyers were largely holding off on purchases ahead of the USDA data, dealers said.
* Chicago Board of Trade December soymeal futures were down $3.20 at $308.20 per ton at 11:38 a.m. CST (1738 GMT).