Alfie Bavidge scored four first-half goals as Inverness CT thrashed Dumbarton 9-0 to notch up a club record win in a game they led 7-0 at the interval.
Queen of the South edged out Dunfermline Athletic 4-3 in a seven-goal thriller at Palmerston to book their place in the last 16 of the competition.
St Johnstone defeated Heart of Midlothian B 1-0 at Ainslie Park while Partick Thistle overcame Cove Rangers 2-1 at Balmoral Stadium.
East Fife beat Elgin City 3-2 at Borough Briggs and Queen's Park were 2-1 winners against Clyde at the City Stadium.
Montrose v The Spartans was postponed due to a frozen pitch and rearranged for Monday December 22, kick-off 7.45pm.
Updated last-16 draw
Airdrieonians v Montrose or The Spartans
Arbroath v East Fife
Ayr United v Stranraer
Partick Thistle v Inverness Caledonian Thistle
Queen's Park v Forfar Athletic
Raith Rovers v Queen of the South
St Johnstone v Ross County
Stirling Albion v Stenhousemuir
Ties to be played January 6/7
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