An improvement of the existing astrophysical data of Fundamental Stars is desirable in order to detect and evaluate astrometric effects which might introduce systematic errors to the Fundamental Catalogue (Jahreiss 1981).
To take into account one of such effects, the magnitude equation, it is necessary to obtain precise and homogeneous photometric data. Up to 1991, no photometric data in the UBV system was available for 354 Stars, South of the Equator, to be included in the Extension of the FK5 Catalogue (Jahreiss 1991).
The UBVRI photometry, in the Kron-Cousins sytem, 272 stars
belonging to the FK5 Extension Catalogue in
the declination zone 
to 
is
given.