European stocks were headed for the fourth straight month of gains for May, but the month was winding down on a lackluster note Monday after tepid economic news out of China and Japan. Market closures due to holidays in London and the U.S. also kept many investors on the sidelines.The Stoxx Europe 600
SXXP,
-0.04%
was flat at 448.88, just under Fridays record closing level of 448.98. For May, the index has gained around 2.5% month to date. The German DAX
DAX,
-0.22%
slipped 0.3% and the French…

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