Evolutionary tracks in the HR diagram of stellar models initially rotating with approximately 200 km s^-1, and with initial masses of 12, 15, 20, 25, 30, 40, 50, 60, 70, 80, 100, 125, 150, 175, 200, 230, 260, 300, 400, and 500  M_⊙. Overlaid are lines (in blue) of constant helium surface mass fraction for Y = 0.28, 0.35, 0.50, and 0.70. Lines of constant helium surface mass fraction for Y = 0.28, 0.35 corresponding to models with approximate initial rotational velocities of 300 and 400 km s^-1 are also shown.