  Temporal and energy characteristics of the very-high-energy gamma-ray bursts
from evaporating primordial black holes have been calculated by assuming that
the photospheric and chromospheric effects are negligible. The technique of
searching for such bursts on shower arrays is described. We show that the burst
time profile and the array dead time should be taken into account to interpret
experimental data. Based on data from the Andyrchy array of the Baksan Neutrino
Observatory (Institute for Nuclear Research, Russian Academy of Sciences), we
have obtained an upper limit on the number density of evaporating primordial
black holes in a local region of space with a scale size of ~10^{-3} pc.
Comparison with the results of previous experiments is made.
