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The limited angular resolution of γ–ray telescopes prevents the straight identification of the majority of the sources detected so far. This is particularly true for the low latitude, probably galactic ones, only 10 % of which has been identified. Most of the counterparts are Isolated Neutron Stars, both radio–loud and radio–quiet, characterised by an extremely high value of fX /fopt. The best way to search for INSs in the error boxes of unidentified EGRET sources is to perform the X–ray coverage of the γ–ray field, followed by the optical characterization of each X–ray source. We applied this procedure to two EGRET sources, which could belong to a local galactic population: 3EG J0616–3310 and 3EG J1249–8330. Here we report on the analysis of about 300 X–ray objects, as well as on their optical study.