We present integrated photometry and color-magnitude diagrams for 161 star clusters in M33 , of which 115 were previously uncataloged , using the Advanced Camera For Surveys Wide Field Channel onboard the Hubble Space Telescope .
The integrated V-band magnitudes of these clusters range from M _ { V } \sim –9 to as faint as M _ { V } \sim –4 , extending the depth of the existing M33 cluster catalogs by \sim 1 mag .
Comparisons of theoretical isochrones to the color-magnitude diagrams using the Padova models yield ages for 148 of these star clusters .
The ages range from Log ( t ) \sim 7.0 to Log ( t ) \sim 9.0 .
Our color-magnitude diagrams are not sensitive to clusters older than \sim 1 Gyr .
We find that the variation of the clusters ’ integrated colors and absolute magnitudes with age is consistent with the predictions of simple stellar population models .
These same models suggest that the masses of the clusters in our sample range from 5 \times 10 ^ { 3 } to 5 \times 10 ^ { 4 } M _ { \odot } .