The efficacy and species specifity of two commercial sticky traps (Ekolex-V and Trappit-Lo Line) were compared in field tests in a multistorey restaurant complex in CZ. Traps were tested under high population density ofblatta orientalis L. (BO) andBlattella germanica (L.) (BG). We found species specific differences in trapping efficiency between the two traps. There was a high correlation between visually estimated counts and actual catches of BG and BO in Trappit. The correlation in Ekolex catches was lower (BG: r=0.86, BO: r=0.58). Nymph/adult ratio increased with increasing population density in both Trappit and Ekolex traps. Although both types of traps reflected differences in population density, we found Trappit more efficient than Ekolex especially forBlatta orientalis. Estimated Trappit/Ekolex ratio of BG catches decreased with increasing population density showing Trappit more sensitive. Trapping sensitivity at low cockroach density was proposed as a standard criterion for evaluation of cockroach trap efficiency.