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We use the semiclassical approach combined with the scaling results for thediffusion coefficient to consider the two-level correlation function$R(\varepsilon)$ for a disordered electron system in the crossover region,characterized by the appearance of a macroscopic correlation or localizationlength, $\xi$, that diverges at the metal-insulator transition. We show newcritical statistics, characterized by a nontrivial asymptotic behavior of$R(\varepsilon)$, to emerge on both sides of the transition at higher energies,and to expand to all energies larger than mean level spacing when $\xi$ exceedsthe system size.Comment: 4 pages,1 figure, in self-ectracting uuencoded gz-compressed file to  be published in Phys. Rev. Letters; REVTeX source file is available upon  reques

Spectral Correlations in Disordered Electronic Systems: Crossover from Metal to Insulator Regime