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We identify nine young stellar objects (YSOs) in the NGC 2264 star-formingregion with optical {\em CoRoT} light curves exhibiting short-duration,shallow, periodic flux dips. All of these stars have infrared (IR) excessesthat are consistent with their having inner disk walls near the Keplerianco-rotation radius. The repeating photometric dips have FWHM generally lessthan one day, depths almost always less than 15%, and periods (3<P<11 days)consistent with dust near the Keplerian co-rotation period. The flux dips varyconsiderably in their depth from epoch to epoch, but usually persist forseveral weeks and, in two cases, were present in data collected on successiveyears. For several of these stars, we also measure the photospheric rotationperiod and find that the rotation and dip periods are the same, as predicted bystandard "disk-locking" models. We attribute these flux dips to clumps ofmaterial in or near the inner disk wall, passing through our line of sight tothe stellar photosphere. In some cases, these dips are also present insimultaneous {\em Spitzer} IRAC light curves at 3.6 and 4.5 microns. Wecharacterize the properties of these dips, and compare the stars with lightcurves exhibiting this behavior to other classes of YSO in NGC 2264. A numberof physical mechanisms could locally increase the dust scale height near theinner disk wall, and we discuss several of those mechanisms; the most plausiblemechanisms are either a disk warp due to interaction with the stellar magneticfield or dust entrained in funnel-flow accretion columns arising near the innerdisk wall.

CSI 2264: Characterizing Young Stars in NGC 2264 with Short-Duration, Periodic Flux Dips in their Light Curves