[Avodah] Chumash Question

[Richard Wolberg]

R' Gershon asked the following question:
When Adam and Chava ate from the Etz hadaas tov vara, the nachash was punished, saying "...ki asisa zos, arur ata...".    When Adam was punished, it was "ki shamaata lekol ishtecha".  Cause and effect.  For the isha, however, it only says "harbo arbeh itzevonech verheronech";  no direct cause cited.  Why?

Adam (and by inference, the nachash) heard the command directly from God. Chava heard it from Adam (which was indirect). Therefore, no direct cause cited.
ri