Excitation functions for the B-3(3u) pi --> 3s and B-3(1g) and (1)A(g) pi --> 3p Rydberg states of ethylene have been measured and found to display structure due to the decay of core-excited anion states. Evidence is also provided that the pi(-1)(3s)(2) anion state undergoes significant decay to the pi --> pi* singlet state in highly twisted configurations.