The present study was realized in three sites of the semiarid region in central Mexico: El Carmen in Guanajuato state, and Amazcala and Cadereyta in Queretaro state. The main aim was to evaluate the interception loss process (EI) of the two dominant species in this region: mesquite (Prosopis laevigata) and huisache (Acacia farnesiana). For each site two trees were selected, and the experiment was carried out following the methodology proposed by Guevara et al. (2007). Two physically-based models, Rutter et al. (1971) and Gash (1979), and one multiple regression model were used in order to model EI. In 2006, the precipitation in El Carmen and Cadereyta was 770 mm and 732 mm respectively, while in Amazcala it reached 451 mm from August to November. The interception loss observed for both species was very similar. The proportion of intercepted rainfall was 30%, 21% and 14 % for huisache and 27%, 21% and 14% for mesquite in Cadereyta, El Carmen and Amazcala respectively. The efficiency coefficient for the EI model during the studied period for the three models was acceptable ranging between -1.19