This paper describes characteristics of end loss electrons (ELE's) from a tandem mirror. Without electron cyclotron resonance heating (plug ECRH), ELE's issue from an ICRF heated hot ion plasma. Their temperature increases with the hot ion diamagnetism. Drag heating of electrons on hot ions balances with axial loss due to Coulomb scattering. Landau damping of an Alfvén ion cyclotron wave is also observed in this phase. On application of the plug ECRH, an intense loss flux of warm electrons is generated The axial heat flow carried by the warm electrons significantly increases. Control of the axial flux of the warm electrons is tried A highly transparent mesh is put up over an end plate and a bias voltage negative to the end plate is applied to the mesh. Then secondary electrons emitted from the end plate are suppressed and the loss flux of the warm electrons decreases to about one third of that without the mesh bias. This reduction factor is much smaller than the value expected from the rate of ion plugging. A possible cause of this is an ion current through a plasma behind the end plate.