  Possibilities of an experimental search for gamma-ray bursts from primordial
black hole (PBH) evaporations in space are reconsidered. It is argued that the
corresponding constraints which can be obtained in experiments with cosmic ray
detectors strongly depend on theoretical approach used for a description of the
PBH evaporation process. Predictions of several theoretical models for
gamma-ray spectra from final stages of PBH life (integrated over time) are
given.
