On the $S_n$-equivariant Euler characteristic of moduli spaces of   hyperelliptic curves
  The generating function for $S_n$-equivariant Euler characteristics of moduli spaces of pointed hyperelliptic curves for any genus g>1 is calculated. This answer generalizes the known ones for genera 2 and 3 and answers obtained by J. Bergstrom for any genus and n<8 points. 
E. Gorsky