  The laboratory detection of previously unobserved resonance-stabilized
C$_9$H$_5$ and C$_9$H$_9$ radicals in the supersonic expansion of a hydrocarbon
discharge source is reported. The radicals are tentatively assigned as
acetylenic-substituted cyclopentadienyl C$_9$H$_5$ and vinyl-substituted benzyl
C$_9$H$_9$ species. They are found to feature visible absorption bands that
coincide with a few very weak diffuse interstellar bands toward HD183143 and
HD204827.
