In the case of a machine for mowing and chopping corn and other similar stalk-like harvested crops, independently of rows, with at least two drawing-in and mowing drums disposed on either side of the vertical, central longitudinal plane of the machine, the cut, harvested crops are supplied to a central chopper over conveying ducts comprising vertical guiding walls. Towards the chopper and in plan view, the guiding walls have the shape of a wave traveling at right angles to the longitudinal, central plane of the machine. As seen in the driving direction, in each region of the wave crests between two adjacent drawing-in and mowing drums, a transverse conveying drum with protruding driving teeth is provided. Through opening slots in the guiding walls, the driving teeth intervene in the conveying duct for the cut, harvested crops.