Abstract. We prove that for a negatively pinched (−b 2 ≤ K ≤ −1) topologically tame 3-manifoldM/Γ , all geometrically infinite ends are simply degenerate. And if the limit set of Γ is the entire boundary sphere at infinity, then the action of Γ on the boundary sphere is ergodic with respect to harmonic measure, and the Poincaré series diverges when the critical exponent is 2.2000 Mathematics Subject Classification. 57M50, 57M60.