  In this note we address the problem of unconventional charmonium-like states
from the standpoint of level spacing theory. The level distribution of the
newly discovered vector resonances is compared to that of standard charmonia
analyzing their spectral rigidities. It is found that the unconventional
charmonium-like states are significantly more compatible with the hypothesis of
being levels from a Gaussian Orthogonal Ensamble of Random Matrices than the
standard ones, which in turn seem more likely to be Poisson distributed. We
discuss the consequences of this result and draw some hints for future
investigations.
