We present color magnitude diagrams of four blue massive and compact star clusters in M31 : G38 , G44 , G94 , and G293 .
The diagrams of the four clusters reveal a well-populated upper main sequence and various numbers of supergiants .
The U-B and B-V colors of the upper main sequence stars are used to determine reddening estimates of the different lines of sight in the M31 disk .
Reddening values range from E _ { B - V } = 0.20 \pm 0.10 to 0.31 \pm 0.11 .
We statistically remove field stars on the basis of completeness , magnitude and color .
Isochrone fits to the field-subtracted , reddening-corrected diagrams yield age estimates ranging from 63 \pm 15 Myr to 160 \pm 60 Myr .
Implications for the recent evolution of the disk near NGC 206 are discussed .