  The so-called HYbrid MOrphology Radio Sources (HYMORS) are a class of objects
that appear to have a mixed Fanaroff-Riley (FR) morphology in a single object;
i.e. a HYMORS has an FR I-type lobe on one side of its nucleus and an FR
II-type lobe on the other side. Because of this unique feature and given that
the origin of the FR morphological dichotomy is still unclear, HYMORS may
possibly play a crucial role in our understanding of the FR-dichotomy. As the
number of known HYMORS is quite small, we aimed to increase that number by
inspecting a few areas of the sky covered by the VLA FIRST survey and by
selecting 21 HYMORS candidates based on the morphology shown in the FIRST
images. They were observed with the VLA in B-conf. at 4.9 GHz. Three objects
from the initial sample turned out to be actual HYMORS and two others very
likely to fulfill the criteria. These five were subsequently re-observed with
the VLA in A-conf. at 1.4 GHz. Our results provide strong support to the
findings of Gopal-Krishna & Wiita (2000), namely that there are two different
kinds of jets in HYMORS; consequently, the existence of FR-dichotomy as a whole
is difficult to reconcile with the class of explanations that posit fundamental
differences in the central engine.
