  We report the discovery of two transiting hot Jupiters, WASP-65b (M_pl = 1.55
+/- 0.16 M_J; R_pl = 1.11 +/- 0.06 R_J), and WASP-75b (M_pl = 1.07 +/- 0.05
M_J; R_pl = 1.27 +/- 0.05 R_J). They orbit their host star every 2.311, and
2.484 days, respectively. The planet host WASP-65 is a G6 star (T_eff = 5600 K,
[Fe/H] = -0.07 +/- 0.07, age > 8 Gyr); WASP-75 is an F9 star (T_eff = 6100 K,
[Fe/H] = 0.07 +/- 0.09, age of 3 Gyr). WASP-65b is one of the densest known
exoplanets in the mass range 0.1 and 2.0 M_J (rho_pl = 1.13 +/- 0.08 rho_J), a
mass range where a large fraction of planets are found to be inflated with
respect to theoretical planet models. WASP-65b is one of only a handful of
planets with masses of around 1.5 M_J, a mass regime surprisingly
underrepresented among the currently known hot Jupiters. The radius of
Jupiter-mass WASP-75b is slightly inflated (< 10%) as compared to theoretical
planet models with no core, and has a density similar to that of Saturn (rho_pl
= 0.52 +/- 0.06 rho_J).
