  We report on four new transiting hot Jupiters discovered by the WASP-South
survey. WASP-178b transits a V = 9.9, A1V star with Teff = 9350 +/- 150 K, the
second-hottest transit host known. It has a highly bloated radius of 1.81 +/-
0.09 Rjup, in line with the known correlation between high irradiation and
large size. With an estimated temperature of 2470 +/- 60 K, the planet is one
of the best targets for studying ultra-hot Jupiters that is visible from the
Southern hemisphere. The three host stars WASP-184, WASP-185 and WASP-192 are
all post-main-sequence G0 stars of ages 4-8 Gyr. The larger stellar radii
(1.3-1.7 Msun) mean that the transits are relatively shallow (0.7-0.9%) even
though the planets have moderately inflated radii of 1.2-1.3 Rjup. WASP-185b
has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4
d. A star that is 4.6 arcsec from WASP-185 and 4.4 mag fainter might be
physically associated.

Earth and Planetary Astrophysics