Contents of Apidologie, 1989, 20, no 5 (Special issue: Genetics) 1) KUHNERT M.E., CARRICK M.J., ALLAN L.F. Use of homogenized drone semen in a bee breeding program in Western Australia pp. 371-381 Institut fur Bienenkunde, Karl von Frisch Weg 2 6370 Oberursel (FRG) 2) MORITZ R.F.A., HILLESHEIM E. Genotypic variance and hoarding behaviour in honeybees pp. 383-390 Bayerische Landesanstalt fur Bienenzucht, Burgbergstr. 70 8520 Erlangen (FRG) 3) KOENIGER N., HEMMLING C., YOSHIDA T. Drones as sons of drones in Apis mellifera pp. 391-394 Institut fur Bienenkunde, Karl von Frisch Weg 2 6370 Oberursel (FRG) 4) RUTTNER F., KAUHAUSEN F., KOENIGER N. Position of the red honey bee Apis koschevnikovi (Buttel-Reepen, 1906) within th e genus Apis pp. 395-404 Institut fur Bienenkunde, Karl von Frisch Weg 2 6370 Oberursel (FRG) 5) RINDERER T.E., KOENIGER N., TINGEK S., MARDAN M., KOENIGER G. A morphological comparison of the cavity dwelling honeybees of Borneo Apis kosch evnikovi and Apis cerana pp. 405-411 USDA, ARS, Honey Bee Breeding, Genetics and Physiology Lab. 1157 Ben Hur Road Baton Rouge LA 70820 (USA) 6) KOENIGER N., KOENIGER G., WONGSIRI S. Mating and sperm transfer in Apis florea pp. 413-418 Chulalongkorn univ., Fac. Science, Dep. Biology Bee Biology Research Unit Bangkok 10500 (Thailand) 7) SHEPPARD W.S., BERLOCHER S.H. Allozyme variation and differentiation among four Apis species pp. 419-431 USDA-ARS, Beneficial Insects Lab. Beltsville MD 20705 (USA) 8) ROTHENBUHLER W.C., PAGE R.E.Jr. Genetic variability for temporal polyethism in colonies consisting of similarly- aged worker honey bees pp. 433-437 Ohio State Univ., Dep. Entomology , 1735 Neil Ave. Columbus OH 43210 (USA) 9) BIENEFELD K., REINHARDT F., PIRCHNER F. Inbreeding effects of queen and workers on colony traits in the honey bee pp. 439-450 Lehrstuhl fur Tierzucht, Technische Universitat Munchen 8050 Freising-Weihenstephan (FRG)