  We use tunable, vacuum ultraviolet laser-based angle-resolved photoemission
spectroscopy and density functional theory calculations to study the electronic
properties of Dirac semimetal candidate cubic PtBi${}_{2}$. In addition to bulk
electronic states we also find surface states in PtBi${}_{2}$ which is expected
as PtBi${}_{2}$ was theoretical predicated to be a candidate Dirac semimetal.
The surface states are also well reproduced from DFT band calculations.
Interestingly, the topological surface states form Fermi contours rather than
double Fermi arcs that were observed in Na$_3$Bi. The surface bands forming the
Fermi contours merge with bulk bands in proximity of the Dirac points
projections, as expected. Our data confirms existence of Dirac states in
PtBi${}_{2}$ and reveals the fragility of the Fermi arcs in Dirac semimetals.
Because the Fermi arcs are not topologically protected in general, they can be
deformed into Fermi contours, as proposed by [Kargarian {\it et al.}, PNAS
\textbf{113}, 8648 (2016)]. Our results demonstrate validity of this theory in
PtBi${}_{2}$.
