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AIMS: In their 1st extension to the Milky Way Star Clusters (MWSC) survey,Schmeja et al. applied photometric filters to the 2MASS to find new clustercandidates that were subsequently confirmed or rejected by the MWSC pipeline.To further extend the MWSC census, we aimed at discovering new clusters byconducting an almost global search in proper motion catalogues as a startingpoint. METHODS: We first selected high-quality samples from the PPMXL and UCAC4for comparison and verification of the proper motions. For 441 circular propermotion bins (radius 15 mas/yr) within $\pm$50 mas/yr, the sky outside a thinGalactic plane zone ($|b|$$<$5$^{\circ}$) was binned in small areas ('skypixels') of 0.25$\times$0.25 deg$^2$. Sky pixels with enhanced numbers of starswith a certain common proper motion in both catalogues were considered ascluster candidates. After visual inspection of the sky images, we built anautomated procedure that combined these representations of the sky forneighbouring proper motion subsamples after a background correction. RESULTS:About half of our 692 candidates overlapped with known clusters (46 globularand 68 open clusters in the Galaxy, about 150 known clusters of galaxies) orthe Magellanic Clouds. About 10% of our candidates turned out to be 63 new openclusters confirmed by the MWSC pipeline. They occupy predominantly the twoinner Galactic quadrants and have apparent sizes and numbers of high-probablemembers slightly larger than those of the typically small MWSC clusters,whereas their other parameters (ages, distances, tidal radii) fall in thetypical ranges. As our search aimed at finding compact clusters, we did notfind new very nearby (extended) clusters. (abridged)

Global survey of star clusters in the Milky Way IV. 63 new open clusters detected by proper motions