Honey bees Apis mellifera (Hymenoptera: Apidae) are widespread species that have differentiated into numerous geographical races or subspecies. Subspecies differ in various characteristics, such as morphology, behavior, and ecology. Body morphology of honeybees is important for the identification of races for breeding. In the present investigation, biometrics of important organs of Carniolan and Egyptian races Apis mellifera lamarckii and their hybrids and backcrosses were compared. An increasing percentage of honeybee workers with improved morphological characteristics were observed after hybridization between an Egyptian virgin queen and Carniolan drones. The F1 generation showed positive heterosis for length and width of the forewing, tongue length, first wax mirror length, hind tibia length, length and width of the basitarsus, and the number of hooks on the hind wing. High heterosis was also seen for body weight of F1workers. Conversely, negative heterosis was recorded for width of the first wax mirror and length of the hind fumer. Heterosis nearly disappeared in the back cross generation for almost all worker characteristics. The progeny of the backcross generation showed, in general, negative or very low heterosis. Thus, these offspring indicate that the backcross is inferior to F1 and also to mid-parental values.