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We revisit the published analyses of ROSAT X-ray observations of the starforming regions NGC 2264 and Chamaeleon I (~3 and ~5 Myr old respectively) inthe light of newly published optical data. At odds with previous results onChamaeleon I members, we find that low mass stars in both regions havenear-saturated emission levels. Similarly to what previously found in the OrionNebula Cluster, Weak Line T-Tauri Stars in NGC 2264 and in the Chamaeleon Icloud have higher X-ray activity levels respect to Classical T Tauri Stars,arguing in favor of a role of the disk and/or accretion in determining X-rayemission.Comment: 12 pages, 9 figures, accepted by A&

Observational clues for a role of circumstellar accretion in PMS X-ray activity